问题[20.04](ubuntu)

我有一台 Das Keyboard 6 Professional，连接到运行 Ubuntu 20.04 的台式电脑。键盘上的灯会随机熄灭，键盘会失去响应。几秒钟后，键盘灯会重新亮起，键盘可以再次使用。

我联系了 Das Keyboard 技术支持，他们认为这不是键盘的问题，而是 Ubuntu 的问题，可能是电源管理的问题。他们说也可能是电磁干扰。

我不确定这是否是我的想象，但当我有一段时间没有使用无线鼠标然后移动它时，这种情况似乎更频繁地发生。

我无法尝试将键盘插入另一个 USB 端口，因为它是 USB-C，而我的计算机只有一个 USB-C 端口。

这实际上是 Ubuntu 的问题吗？如果是，有办法解决吗？

我愿意将 Ubuntu 升级到较新的版本。

编辑： 根据@Vercingatorix的建议，我在最近一次关机后运行了dmesg。这是我得到的结果：

[  424.188465] usb 1-4.4: USB disconnect, device number 5
[  424.798955] usb 1-4.4: new full-speed USB device number 7 using xhci_hcd
[  424.953215] usb 1-4.4: New USB device found, idVendor=24f0, idProduct=20a1, bcdDevice= 1.14
[  424.953230] usb 1-4.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  424.953236] usb 1-4.4: Product: Das Keyboard 6 Pro
[  424.953241] usb 1-4.4: Manufacturer: Das Keyboard
[  424.962318] input: Das Keyboard Das Keyboard 6 Pro as /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4.4/1-4.4:1.0/0003:24F0:20A1.0004/input/input25
[  425.103228] hid-generic 0003:24F0:20A1.0004: input,hidraw0: USB HID v1.11 Keyboard [Das Keyboard Das Keyboard 6 Pro] on usb-0000:00:14.0-4.4/input0
[  425.106765] input: Das Keyboard Das Keyboard 6 Pro Keyboard as /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4.4/1-4.4:1.1/0003:24F0:20A1.0005/input/input26
[  425.163308] input: Das Keyboard Das Keyboard 6 Pro as /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4.4/1-4.4:1.1/0003:24F0:20A1.0005/input/input27
[  425.163979] hid-generic 0003:24F0:20A1.0005: input,hiddev0,hidraw1: USB HID v1.11 Keyboard [Das Keyboard Das Keyboard 6 Pro] on usb-0000:00:14.0-4.4/input1

编辑：

这是来自 journalctl 的

Mar 05 10:20:33 Meow sudo[7864]: pam_unix(sudo:session): session opened for user root by (uid=0)
Mar 05 10:20:33 Meow sudo[7864]:   bwroga : TTY=pts/1 ; PWD=/home/bwroga ; USER=root ; COMMAND=/usr/>
Mar 05 10:20:21 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:21 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:21 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:21 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:21 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:21 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:21 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:21 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:21 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow gnome-shell[1609]: Window manager warning: Overwriting existing binding of keys>
Mar 05 10:20:18 Meow mtp-probe[7858]: bus: 1, device: 8 was not an MTP device
Mar 05 10:20:18 Meow mtp-probe[7858]: checking bus 1, device 8: "/sys/devices/pci0000:00/0000:00:14.>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) This device may have been added with an>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) No input driver specified, ignoring thi>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) config/udev: Adding input device Das Ke>
Mar 05 10:20:18 Meow kernel: audit: type=1107 audit(1741188018.275:295): pid=1102 uid=103 auid=42949>
                              exe="/usr/bin/dbus-daemon" sauid=103 hostname=? addr=? terminal=?'
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (WW) Option "xkb_options" requires a string >
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (WW) Option "xkb_variant" requires a string >
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Option "xkb_layout" "us"
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Option "xkb_model" "pc105"
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) XINPUT: Adding extended input device "D>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Option "config_info" "udev:/sys/devices>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) libinput: Das Keyboard Das Keyboard 6 P>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Option "_source" "_driver/libinput"
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Option "Device" "/dev/input/event4"
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Das Keyboard Das Keyboard 6 Pro Keyboar>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) systemd-logind: returning pre-existing >
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) Using input driver 'libinput' for 'Das >
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Das Keyboard Das Keyboard 6 Pro Keyboar>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) event4  - Das Keyboard Das Keyboard 6 P>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) event4  - Das Keyboard Das Keyboard 6 P>
Mar 05 10:20:18 Meow audit[1102]: USER_AVC pid=1102 uid=103 auid=4294967295 ses=4294967295 subj=unco>
                                   exe="/usr/bin/dbus-daemon" sauid=103 hostname=? addr=? terminal=?'
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Das Keyboard Das Keyboard 6 Pro Keyboar>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Das Keyboard Das Keyboard 6 Pro Keyboar>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Das Keyboard Das Keyboard 6 Pro Keyboar>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Option "AccelerationScheme" "none"
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) XINPUT: Adding extended input device "D>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Option "config_info" "udev:/sys/devices>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) libinput: Das Keyboard Das Keyboard 6 P>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) event4  - Das Keyboard Das Keyboard 6 P>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) event4  - Das Keyboard Das Keyboard 6 P>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) event4  - Das Keyboard Das Keyboard 6 P>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Option "_source" "server/udev"
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Option "Device" "/dev/input/event4"
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Das Keyboard Das Keyboard 6 Pro Keyboar>
Mar 05 10:20:18 Meow kernel: audit: type=1107 audit(1741188018.271:294): pid=1102 uid=103 auid=42949>
                              exe="/usr/bin/dbus-daemon" sauid=103 hostname=? addr=? terminal=?'
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) systemd-logind: got fd for /dev/input/e>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) Using input driver 'libinput' for 'Das >
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Das Keyboard Das Keyboard 6 Pro Keyboar>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) config/udev: Adding input device Das Ke>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) event3  - Das Keyboard Das Keyboard 6 P>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) event3  - Das Keyboard Das Keyboard 6 P>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (WW) Option "xkb_options" requires a string >
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (WW) Option "xkb_variant" requires a string >
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Option "xkb_layout" "us"
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Option "xkb_model" "pc105"
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) XINPUT: Adding extended input device "D>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Option "config_info" "udev:/sys/devices>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) event3  - Das Keyboard Das Keyboard 6 P>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) event3  - Das Keyboard Das Keyboard 6 P>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) event3  - Das Keyboard Das Keyboard 6 P>
Mar 05 10:20:18 Meow audit[1102]: USER_AVC pid=1102 uid=103 auid=4294967295 ses=4294967295 subj=unco>
                                   exe="/usr/bin/dbus-daemon" sauid=103 hostname=? addr=? terminal=?'
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Option "_source" "server/udev"
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Option "Device" "/dev/input/event3"
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Das Keyboard Das Keyboard 6 Pro: always>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) systemd-logind: got fd for /dev/input/e>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) Using input driver 'libinput' for 'Das >
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Das Keyboard Das Keyboard 6 Pro: Applyi>
Mar 05 10:20:18 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) config/udev: Adding input device Das Ke>
Mar 05 10:20:18 Meow systemd-logind[1148]: Watching system buttons on /dev/input/event4 (Das Keyboar>
Mar 05 10:20:18 Meow systemd-logind[1148]: Watching system buttons on /dev/input/event3 (Das Keyboar>
Mar 05 10:20:18 Meow upowerd[1706]: treating change event as add on /sys/devices/pci0000:00/0000:00:>
Mar 05 10:20:18 Meow kernel: audit: type=1400 audit(1741188018.231:293): apparmor="DENIED" operation>
Mar 05 10:20:18 Meow audit[7154]: AVC apparmor="DENIED" operation="open" profile="snap.spotify.spoti>
Mar 05 10:20:18 Meow mtp-probe[7830]: bus: 1, device: 8 was not an MTP device
Mar 05 10:20:18 Meow mtp-probe[7830]: checking bus 1, device 8: "/sys/devices/pci0000:00/0000:00:14.>
Mar 05 10:20:18 Meow kernel: hid-generic 0003:24F0:20A1.0005: input,hiddev0,hidraw1: USB HID v1.11 K>
Mar 05 10:20:18 Meow kernel: input: Das Keyboard Das Keyboard 6 Pro as /devices/pci0000:00/0000:00:1>
Mar 05 10:20:18 Meow kernel: input: Das Keyboard Das Keyboard 6 Pro Keyboard as /devices/pci0000:00/>
Mar 05 10:20:18 Meow kernel: hid-generic 0003:24F0:20A1.0004: input,hidraw0: USB HID v1.11 Keyboard >
Mar 05 10:20:18 Meow kernel: input: Das Keyboard Das Keyboard 6 Pro as /devices/pci0000:00/0000:00:1>
Mar 05 10:20:18 Meow kernel: usb 1-4.4: Manufacturer: Das Keyboard
Mar 05 10:20:18 Meow kernel: usb 1-4.4: Product: Das Keyboard 6 Pro
Mar 05 10:20:18 Meow kernel: usb 1-4.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Mar 05 10:20:17 Meow kernel: usb 1-4.4: New USB device found, idVendor=24f0, idProduct=20a1, bcdDevi>
Mar 05 10:20:17 Meow kernel: usb 1-4.4: device descriptor read/64, error -32
Mar 05 10:20:17 Meow kernel: usb 1-4.4: new full-speed USB device number 8 using xhci_hcd
Mar 05 10:20:17 Meow upowerd[1706]: treating change event as add on /sys/devices/pci0000:00/0000:00:>
Mar 05 10:20:17 Meow kernel: audit: type=1400 audit(1741188017.012:292): apparmor="DENIED" operation>
Mar 05 10:20:17 Meow audit[7154]: AVC apparmor="DENIED" operation="open" profile="snap.spotify.spoti>
Mar 05 10:20:17 Meow upowerd[1706]: treating change event as add on /sys/devices/pci0000:00/0000:00:>
Mar 05 10:20:17 Meow kernel: hub 1-4:1.0: 4 ports detected
Mar 05 10:20:17 Meow kernel: hub 1-4:1.0: USB hub found
Mar 05 10:20:17 Meow kernel: usb 1-4: SerialNumber: 000000000
Mar 05 10:20:17 Meow kernel: usb 1-4: Manufacturer: VIA Labs, Inc.         
Mar 05 10:20:17 Meow kernel: usb 1-4: Product: USB2.0 Hub             
Mar 05 10:20:17 Meow kernel: usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Mar 05 10:20:16 Meow kernel: usb 1-4: New USB device found, idVendor=2109, idProduct=2817, bcdDevice>
Mar 05 10:20:16 Meow kernel: usb 1-4: new high-speed USB device number 7 using xhci_hcd
Mar 05 10:20:16 Meow kernel: audit: type=1400 audit(1741188016.713:291): apparmor="DENIED" operation>
Mar 05 10:20:16 Meow audit[7154]: AVC apparmor="DENIED" operation="open" profile="snap.spotify.spoti>
Mar 05 10:20:16 Meow kernel: hub 2-4:1.0: 4 ports detected
Mar 05 10:20:16 Meow kernel: hub 2-4:1.0: USB hub found
Mar 05 10:20:16 Meow kernel: usb 2-4: SerialNumber: 000000000
Mar 05 10:20:16 Meow kernel: usb 2-4: Manufacturer: VIA Labs, Inc.         
Mar 05 10:20:16 Meow kernel: usb 2-4: Product: USB3.0 Hub             
Mar 05 10:20:16 Meow kernel: usb 2-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Mar 05 10:20:16 Meow kernel: usb 2-4: New USB device found, idVendor=2109, idProduct=0817, bcdDevice>
Mar 05 10:20:16 Meow kernel: usb 2-4: new SuperSpeed USB device number 3 using xhci_hcd
Mar 05 10:20:15 Meow acpid[1096]: input device has been disconnected, fd 23
Mar 05 10:20:15 Meow acpid[1096]: input device has been disconnected, fd 22
Mar 05 10:20:15 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) systemd-logind: releasing fd for 13:68
Mar 05 10:20:15 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) UnloadModule: "libinput"
Mar 05 10:20:15 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) event4  - Das Keyboard Das Keyboard 6 P>
Mar 05 10:20:15 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Option "fd" "50"
Mar 05 10:20:15 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) config/udev: removing device Das Keyboa>
Mar 05 10:20:15 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) systemd-logind: not releasing fd for 13>
Mar 05 10:20:15 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) UnloadModule: "libinput"
Mar 05 10:20:15 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Option "fd" "50"
Mar 05 10:20:15 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) config/udev: removing device Das Keyboa>
Mar 05 10:20:15 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) systemd-logind: releasing fd for 13:67
Mar 05 10:20:15 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) UnloadModule: "libinput"
Mar 05 10:20:15 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) event3  - Das Keyboard Das Keyboard 6 P>
Mar 05 10:20:15 Meow /usr/lib/gdm3/gdm-x-session[1328]: (**) Option "fd" "49"
Mar 05 10:20:15 Meow /usr/lib/gdm3/gdm-x-session[1328]: (II) config/udev: removing device Das Keyboa>
Mar 05 10:20:15 Meow audit[1102]: USER_AVC pid=1102 uid=103 auid=4294967295 ses=4294967295 subj=unco>
                                   exe="/usr/bin/dbus-daemon" sauid=103 hostname=? addr=? terminal=?'
Mar 05 10:20:15 Meow audit[1102]: USER_AVC pid=1102 uid=103 auid=4294967295 ses=4294967295 subj=unco>
                                   exe="/usr/bin/dbus-daemon" sauid=103 hostname=? addr=? terminal=?'
Mar 05 10:20:15 Meow kernel: audit: type=1107 audit(1741188015.902:290): pid=1102 uid=103 auid=42949>
                              exe="/usr/bin/dbus-daemon" sauid=103 hostname=? addr=? terminal=?'
Mar 05 10:20:15 Meow kernel: usb 2-4: USB disconnect, device number 2
Mar 05 10:20:15 Meow kernel: audit: type=1107 audit(1741188015.726:289): pid=1102 uid=103 auid=42949>
                              exe="/usr/bin/dbus-daemon" sauid=103 hostname=? addr=? terminal=?'
Mar 05 10:20:15 Meow kernel: usb 1-4.4: USB disconnect, device number 5
Mar 05 10:20:15 Meow kernel: usb 1-4: USB disconnect, device number 2
Mar 05 10:18:17 Meow systemd[1]: Finished Ubuntu Pro Timer for running repeated jobs.

我有一个外部驱动器，并已检查 Ubuntu 在使用 lsusb 插入时是否能识别它

MediaTek Inc. 三星 SE-S084 Super WriteMaster Slim 外置 DVD 刻录机

我还可以可靠地看到“磁盘”应用程序中列出的 CD/DVD 驱动器。

但遗憾的是，只要我把光盘放入其中（无论是 CD 还是 DVD），它就会：

1. 开始像预期的那样发出呼呼声
2. 然后它就会停止旋转
3. 该驱动器将从“磁盘”应用程序中消失
4. 然后它将重新出现在“磁盘”中
5. 循环回到 1 并重复

我确信这在过去一两个月内是有效的，所以想知道升级或权限更改是否会影响这一点。

插入光盘后运行 dmesg 会输出如下内容：

[ +20.097292] usb 3-3: USB disconnect, device number 71
[  +0.159147] [UFW BLOCK] IN=wlp0s20f3 OUT= MAC=f0:20:ff:5b:7d:81:00:11:32:df:df:e9:08:00 SRC=192.168.1.54 DST=192.168.1.48 LEN=1365 TOS=0x00 PREC=0x00 TTL=64 ID=48489 DF PROTO=UDP SPT=3702 DPT=55889 LEN=1345 
[  +3.494338] usb 3-3: new high-speed USB device number 72 using xhci_hcd
[  +0.130560] usb 3-3: New USB device found, idVendor=0e8d, idProduct=1836, bcdDevice= 0.00
[  +0.000005] usb 3-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  +0.000001] usb 3-3: Product: SES084D
[  +0.000001] usb 3-3: Manufacturer: TSST Inc    
[  +0.000000] usb 3-3: SerialNumber: R96X911 
[  +0.004014] usb-storage 3-3:1.0: USB Mass Storage device detected
[  +0.000209] scsi host0: usb-storage 3-3:1.0
[  +1.034492] scsi 0:0:0:0: CD-ROM            TSSTcorp CDDVDW SE-S084F  TS00 PQ: 0 ANSI: 0
[  +0.011374] sr 0:0:0:0: Power-on or device reset occurred
[  +0.018203] sr 0:0:0:0: [sr0] scsi3-mmc drive: 8x/24x writer dvd-ram cd/rw xa/form2 cdda tray
[  +0.011453] sr 0:0:0:0: Attached scsi CD-ROM sr0
[  +0.000084] sr 0:0:0:0: Attached scsi generic sg0 type 5
[  +5.048998] usb 3-3: USB disconnect, device number 72

谢谢你提供的任何建议，丹

[我已接受此答案，以感谢为调试付出大量努力的人。不要搜索它来寻找明确的答案，没有答案。我把耳机带回商店，它就正常工作了。就像魔术一样。我仍然不知道为什么。我回去是因为我们得出结论，问题可能根本不是 ubuntu。我们正处于挑战所有假设的阶段。]

许多页面上都有很多针对此问题的建议解决方案。我尝试了很多方法。到目前为止，没有成功。...问我你想知道什么...

我正在使用带有麦克风的耳机。

[编辑：]

进一步的探索表明，我尝试过的“解决方案”使问题变得更加严重。现在我的电脑上根本没有声音。我估计解决这个问题需要查询电脑的状态，重新安装关键程序等。

这是：Ubuntu 20.04.6 LTS，Dell Latitude e7450。

好的，我已经重新安装了 pulseaudio，声音又回来了。很好。

..顺便说一下，这是网络版 Skype，不确定是否有任何区别..

pavucontrol 似乎可以识别耳机麦克风.. pulsemixer 似乎不能。

这里第一种方法似乎不起作用。大声说出来似乎没有什么区别。第二种方法也没有记录任何内容。第三条消息的输出如下：

(base) eriadar@eriadar-Latitude-E7440:~$ arecord -l
**** List of CAPTURE Hardware Devices ****
card 1: PCH [HDA Intel PCH], device 0: ALC3226 Analog [ALC3226 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
(base) eriadar@eriadar-Latitude-E7440:~$ arecord -d 5 test-mic.wav       && aplay test-mic.wav && rm test-mic.wav
Recording WAVE 'test-mic.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Mono
Playing WAVE 'test-mic.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Mono

似乎没有录制任何音频。

..我现在已经更新并升级了我的系统。..有趣的是，在 pavucontrol 中，它似乎正在录音，但当我大声说话时，它没有反应。

尝试了此处接受的答案，没有成功。尝试了pulseaudio -k，没有变化。

我曾尝试实现这个答案，但是我不清楚如何使用 kernel.org。

[进一步编辑：]

parec 的输出：（很有趣，但又有点紧张，伴随着一系列音频信号）

“你不是说过重新安装 pulseaudio 后麦克风就可以正常工作了吗？”

我不清楚这一点。-有些事情-正在发生，指示器上下移动，就像背景环境声音一样，但是当我说话或大声说话时，它不会像人们预期的那样做出反应。

“除非你已经弄乱了一些文件，这是大忌（/home、/etc 和 /usr/local 之外的任何东西都属于发行版区域，永远不应手动修改）”

我弄乱了 /home/.config/pulse，就是这样，进入文件管理器中的文件结构并对其进行修改。那些文件似乎都又出现了。至于我可能对命令行所做的愚蠢行为，我不会拿我的名誉冒险。我 - 可能 - 没有做任何带有警告的事情。

(base) eriadar@eriadar-Latitude-E7440:~$ sudo debsums --all -- changed | tee debsums-changed.log
/usr/share/applications/chromium-browser.desktop
/etc/gnome/defaults.list
/usr/share/applications/org.gnome.Evince.desktop
/usr/share/applications/org.gnome.FileRoller.desktop
/usr/share/applications/org.gnome.gedit.desktop
/usr/share/applications/org.gnome.Terminal.desktop
/usr/share/applications/org.gnome.Nautilus.desktop
/etc/vsftpd.conf

我个人没有看到其中有任何与音频相关的东西。

[第三次(?)编辑:]

“如果没有提供文件名，parec 会将数据发送到 stdout，从而导致终端混乱。另外，显然必须将其作为 parecord 运行，以便它能够自动转换为指定的文件类型：”

..我觉得我可以解决这个问题。..这表明我没有尝试，我是多么的疲惫。

试过这个：parecord mic-capture.wav，它记录了静态。我基本上按照你的建议移动了文件。它根本没有记录任何东西，即使文件放回去了。一个新的 cookie 被覆盖了，这可能是问题所在。

^C(base) eriadar@eriadar-Latitude-E7440:~$ pulseaudio -k
(base) eriadar@eriadar-Latitude-E7440:~$ pactl exit
(base) eriadar@eriadar-Latitude-E7440:~$ echo quit | pacmd
Unknown command: quit
(base) eriadar@eriadar-Latitude-E7440:~$ parecord mic-capture.wav

音频文件仍然为空。

(base) eriadar@eriadar-Latitude-E7440:~$ sudo debsums --all --changed | tee debsums-changed.log
/usr/share/applications/chromium-browser.desktop
/etc/gnome/defaults.list
/usr/share/applications/org.gnome.Evince.desktop
/usr/share/applications/org.gnome.FileRoller.desktop
/usr/share/applications/org.gnome.gedit.desktop
/usr/share/applications/org.gnome.Terminal.desktop
/usr/share/applications/org.gnome.Nautilus.desktop
/etc/vsftpd.conf
(base) eriadar@eriadar-Latitude-E7440:~$ 

[进一步编辑..]

是的，肯定是空的。

pactl list sources

更有趣，也更长。将包括几张屏幕截图（请注意后两张故意重叠的截图）：

所以，显然，“某物”确实看到了耳机麦克风......所以我们取得了一些进展......

(base) eriadar@eriadar-Latitude-E7440:~$ pactl get-default-source
No valid command specified.
(base) eriadar@eriadar-Latitude-E7440:~$ 

..哎呀.. ..感觉 - 有些 - 动力去找出正确的命令是什么..

[由@PeeWee 编辑]：（我认为，目前最好就地编辑您的问题，请参阅我的答案下方的最后一条评论）

该命令在 Ubuntu 24.04 中有效，因此在 20.04 中可能没有等效命令。我相信它pacmd支持更多命令，但语法不同 IIRC；但它支持交互模式，通过不带参数运行它，您可以“探索”。[/编辑]

我想更改键盘布局，因为我有瑞典语键盘。

我尝试了设置 => 区域和语言 => 输入源 = 管理已安装的语言 => “+”

但无法添加/更改键盘语言。请看一下并告诉我如何解决这个问题。提前谢谢。

我在 Windows 主机上的虚拟机下运行 Ubuntu 20.04。

我需要知道我们通常在 Ubuntu 中将程序安装在哪里。如果安装属于所有用户，则在哪个目录中，如果安装仅属于特定用户，则在哪个目录中。

我想安装 Pycharm。我在一些网页上发现 Pycharm 需要安装在 /opt 文件夹下。

我尝试在 /opt 文件夹下为 Pycharm 安装创建一个新文件夹，但这不起作用。

请告诉我如何在 /opt 下创建一个新文件夹。

我想ifconfig在虚拟机中运行 Ubuntu 中的命令。它要求我先运行，sudo apt install net-tools但我收到错误E: Unable to locate package net

请告诉我如何运行ifconfig来查找 IP 地址。

1- 我无法调整显示大小。它只显示缩放比例，而不是调整大小。如何调整屏幕大小？

2- 我已经在 Ubuntu 20.04 设备 => 共享文件夹 => 共享文件夹设置 => 机器文件夹 => 添加新共享文件夹 => 自动挂载 => 设为永久。我还关闭了 Virtual Box 中的 Ubuntu 20.04 并重新启动。我无法在“其他位置”找到该文件夹​​。请告诉我如何在 Virtual Box 中在 Windows 主机和 Ubuntu 之间共享文件夹？

由于我无法让 BackupPC 在 Ubuntu 24 上运行，因此决定使用 Ubuntu 20，它具有可用于 BackupPC 的安装，我安装了它并可以运行，但意识到那是 BackupPC v3，并被要求安装 v4。

有没有办法使用 apt 或 apt-get 来“升级”到 BackupPC v4？或者有文档可以按照它来手动更新？

或者告诉我哪个版本的 Ubuntu 服务器附带 BackupPC 4。

很长一段时间以来，每当我尝试通过运行命令释放磁盘空间时，tex-common 都会出现错误sudo apt-get autoremove。错误如下：

dpkg: error processing package tex-common (--configure):
 installed tex-common package post-installation script subprocess returned error exit status 2
Errors were encountered while processing:
 tex-common

我尝试了sudo dpkg -C和sudo dpkg --configure tex-common以及sudo apt-get install --reinstall tex-common类似的输出。我还尝试重新配置区域设置（如本文《无法在 Ubuntu 20.04.2 LTS 上配置 tex-common》中所建议的），但这并不能解决问题。此外，我收到以下警告：

perl: warning: Please check that your locale settings:
    LANGUAGE = (unset),
    LC_ALL = "en_US.UTF-8",
    LC_TIME = "de_AT.UTF-8",
    LC_MONETARY = "de_AT.UTF-8",
    LC_ADDRESS = "de_AT.UTF-8",
    LC_TELEPHONE = "de_AT.UTF-8",
    LC_NAME = "de_AT.UTF-8",
    LC_MEASUREMENT = "de_AT.UTF-8",
    LC_IDENTIFICATION = "de_AT.UTF-8",
    LC_NUMERIC = "de_AT.UTF-8",
    LC_PAPER = "de_AT.UTF-8",
    LANG = "en_US.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

我猜我遇到的错误与 texlive 安装有关。我目前使用位于 /usr/local/texlive 的 texlive 2023。但是，tex-common 位于 /usr/share/tex-common。我大约 1.5 年前升级到 texlive 2023，一开始一切都运行顺利（就我记得）。

我不知道如何解决这个问题，也不想让事情变得更糟（可能比我已经做的更糟）。因此，我恳请社区提供帮助。如果需要额外的输出或信息，请告诉我。

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.6 LTS
Release:    20.04
Codename:   focal

$ uname -r
5.15.0-125-generic

我正在尝试使用 Emacs 和 proof general 使用 snap 安装的 coq 定理证明助手。不幸的是，我遇到了错误。在使用 strace 进行调查后，我发现错误是由futex程序尝试处理目录中的文件时系统调用“权限被拒绝”引起的/tmp：

$ strace coqdep /tmp/ProofGeneral-coqofYWUP.v

trying to imitate what proof general does and got the following:

--- SIGURG {si_signo=SIGURG, si_code=SI_TKILL, si_pid=123729, si_uid=1000} ---
rt_sigreturn({mask=[]})                 = 22
getpid()                                = 123729
tgkill(123729, 123751, SIGURG)          = 0
getpid()                                = 123729
tgkill(123729, 123750, SIGURG)          = 0
futex(0x55610de9d158, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x55610de9d250, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=100000}) = 0
getpid()                                = 123729
tgkill(123729, 123751, SIGURG)          = 0
getpid()                                = 123729
tgkill(123729, 123750, SIGURG)          = 0
futex(0x55610de9d158, FUTEX_WAKE_PRIVATE, 1) = 1
getpid()                                = 123729
tgkill(123729, 123751, SIGURG)          = 0
futex(0x55610de9d158, FUTEX_WAKE_PRIVATE, 1) = 1
epoll_pwait(4, [], 128, 0, NULL, 0)     = 0
futex(0xc000100948, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x55610de9d250, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=100000}) = 0
close(3)                                = 0
futex(0x55610de9bc28, FUTEX_WAIT_PRIVATE, 0, NULL) = 0
epoll_pwait(4, [{EPOLLOUT, {u32=1967093352, u64=140516117149288}}], 128, 0, NULL, 0) = 1
epoll_pwait(4, [{EPOLLOUT, {u32=1967093352, u64=140516117149288}}], 128, -1, NULL, 0) = 1
epoll_pwait(4, [], 128, 0, NULL, 191668) = 0
futex(0x55610de9bc28, FUTEX_WAIT_PRIVATE, 0, NULL) = 0
epoll_pwait(4, [{EPOLLIN|EPOLLOUT, {u32=1967093592, u64=140516117149528}}], 128, 0, NULL, 0) = 1
epoll_pwait(4, [{EPOLLOUT, {u32=1967093352, u64=140516117149288}}], 128, -1, NULL, 0) = 1
epoll_pwait(4, [], 128, 0, NULL, 191668) = 0
epoll_pwait(4, [{EPOLLIN|EPOLLOUT, {u32=1967093352, u64=140516117149288}}], 128, -1, NULL, 0) = 1
recvmsg(3, {msg_name={sa_family=AF_UNIX, sun_path="/run/user/1000/bus"}, msg_namelen=112->21, msg_iov=[{iov_base="l\2\1\1'\0\0\0l\4\0\0-\0\0\0", iov_len=16}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 16
recvmsg(3, {msg_name={sa_family=AF_UNIX, sun_path="/run/user/1000/bus"}, msg_namelen=112->21, msg_iov=[{iov_base="\5\1u\0\2\0\0\0\6\1s\0\6\0\0\0:1.155\0\0\10\1g\0\1o\0\0"..., iov_len=48}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 48
recvmsg(3, {msg_name={sa_family=AF_UNIX, sun_path="/run/user/1000/bus"}, msg_namelen=112->21, msg_iov=[{iov_base="\"\0\0\0/org/freedesktop/systemd1/jo"..., iov_len=39}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 39
futex(0xc000100948, FUTEX_WAKE_PRIVATE, 1) = 1
recvmsg(3, {msg_namelen=112}, MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
openat(AT_FDCWD, "/proc/123729/cgroup", O_RDONLY|O_CLOEXEC) = 8
epoll_ctl(4, EPOLL_CTL_ADD, 8, {EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLET, {u32=1967093592, u64=140516117149528}}) = -1 EPERM (Operation not permitted)
read(8, "13:cpuset:/\n12:rdma:/\n11:memory:"..., 4096) = 547
close(8)                                = 0
write(6, "\0", 1)                       = 1
futex(0x55610de9bc28, FUTEX_WAIT_PRIVATE, 0, NULL) = 0
epoll_pwait(4, [], 128, 0, NULL, 0)     = 0
epoll_pwait(4,  <unfinished ...>)       = ?
*** Error: /tmp/ProofGeneral-coqofYWUP.v: No such file or directory
+++ exited with 1 +++

• 不幸的是，我没有足够的资格去理解是什么原因导致系统调用权限被拒绝。我甚至把这个文件的权限设为 777，但还是没用。

• 将文件复制到我的主目录后，它开始工作：

$ cp /tmp/ProofGeneral-coqofYWUP.v ~/aaa.v
$ coqdep ~/aaa.v
home/usr345/aaa.vo /home/usr345/aaa.glob /home/usr345/aaa.v.beautified /home/usr345/aaa.required_vo: /home/usr345/aaa.v 
/home/usr345/aaa.vio: /home/usr345/aaa.v