我在 cat /etc/sysctl.confcat 中有 fs.inotify.max_user_watches=524288
尽管如此，每次发行版升级，以及“时不时”我必须执行“sudo sysctl -p”
- 为什么不持久保存？并且不时减少到 64k？
我尝试了 Audacity，因为有说明，以前也用过。但 ALSA 不再是一个选项。（这是说明要求的）我看到“pulseaudio、pipewire 和 default”作为录音设备，但似乎没有输出音频的设备。
我已经安装了踏板车软件中的“超越比较”。
现在，在 apt update 上我得到：
Ign:17 https://www.scootersoftware.com bcompare4 InRelease
Get:18 https://www.scootersoftware.com bcompare4 Release [1 731 B]
Get:19 https://www.scootersoftware.com bcompare4 Release.gpg [836 B]
Err:19 https://www.scootersoftware.com bcompare4 Release.gpg
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EC34ED227AFAE3F2
Fetched 327 kB in 1s (219 kB/s)
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
All packages are up-to-date.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://www.scootersoftware.com bcompare4 Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EC34ED227AFAE3F2
W: Failed to fetch https://www.scootersoftware.com/dists/bcompare4/Release.gpg The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EC34ED227AFAE3F2
W: Some index files failed to download. They have been ignored, or old ones used instead.
问题是我在“软件和更新”（GUI）中看不到该源 - 在 /etc/apt/sources.list 中也不可见
所以 - 这让我思考：我可能还有哪些我不知道的 PPA？- 这似乎不是很明智/安全。我明白了 - 我确实安装了该软件，但我仍然希望添加的源在 PPA 中可见？- 或者我错过了什么？
Ubuntu 23.10 上引入了新软件：一个新的基于 Flutter 的应用程序中心和一个固件更新工具，可以在Ubuntu Desktop 23.10：Mantic Minotaur 深入探讨中阅读。
但是，从 Ubuntu 23.04 升级到 23.10 后，我找不到这两个工具。
我怎样才能得到它们？
在将 Ubuntu 21.04 升级到 21.10 之后，我遇到了这个问题：Chromium/Firefox 无法启动。错误（在终端中看到）是：
$ firefox
cannot attach cgroup program: Operation not permitted
SSD 有很长一段时间什么都不做。
- 我怎样才能找到故障并修复它？
- 已经检查
/etc/fstab，没有交换或任何错误（32GB RAM，没有交换）
[ 2.173492] usb 2-1.6: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 2.173497] usb 2-1.6: Product: DW375 Bluetooth Module
[ 2.173501] usb 2-1.6: Manufacturer: Dell Computer Corp
[ 2.173511] usb 2-1.6: SerialNumber: 7CE9D3C0713B
[ 2.323728] ata4: SATA link down (SStatus 0 SControl 300)
[ 2.441062] input: AlpsPS/2 ALPS GlidePoint as /devices/platform/i8042/serio1/input/input6
[ 2.640309] ata5: SATA link down (SStatus 0 SControl 300)
[ 2.954947] ata6: SATA link down (SStatus 0 SControl 300)
[ 3.068090] clocksource: Switched to clocksource tsc
[ 36.584826] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)
[ 36.726117] ip_tables: (C) 2000-2006 Netfilter Core Team
[ 36.732610] systemd[1]: systemd 237 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +AC
L +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid)
[ 36.751996] systemd[1]: Detected architecture x86-64.
[ 36.753867] systemd[1]: Set hostname to <latitude-e5520>.
[ 36.868561] systemd[1]: Started Forward Password Requests to Wall Directory Watch.
[ 36.868594] systemd[1]: Reached target Remote File Systems.
[ 36.868751] systemd[1]: Created slice User and Session Slice.
[ 36.868869] systemd[1]: Created slice System Slice.
[ 36.868948] systemd[1]: Listening on udev Control Socket.
[ 36.868957] systemd[1]: Reached target Slices.
[ 36.868996] systemd[1]: Listening on udev Kernel Socket.
[ 36.895156] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro
[ 36.898185] lp: driver loaded but no devices found
[ 36.903941] ppdev: user-space parallel port driver
升级到 15.04 后，一台计算机的启动速度非常非常慢 - 几分钟，而不是大约 20 秒。
我不知道这是否有帮助：
graphical.target @1min 40.961s
└─multi-user.target @1min 40.961s
└─kerneloops.service @1min 36.392s +16ms
└─network-online.target @1min 36.391s
└─network.target @1min 30.948s
└─wpa_supplicant.service @1min 31.430s +6ms
└─basic.target @1min 30.414s
└─sockets.target @1min 30.414s
└─acpid.socket @1min 30.414s
└─sysinit.target @1min 30.412s
└─networking.service @1.941s +49ms
└─apparmor.service @1.383s +555ms
└─local-fs.target @1.381s
└─media-andre-6564\x2d3236.mount @2min 17.386s
└─local-fs-pre.target @1.375s
└─systemd-remount-fs.service @1.328s +41ms
└─systemd-fsck-root.service @1.197s +129ms
└─system.slice @324ms
└─-.slice @323ms
andre@andre-Latitude-E5520:~$ systemd
Failed to create root cgroup hierarchy: Permission denied
Failed to allocate manager object: Permission denied
专有驱动程序 331.89 不给我 OpenCL。（尝试过测试/更新）有一段时间我的版本 304.123 有效 - 除了我想要当前的驱动程序，现在无法降级。
无论如何 - 我可以通过解决方法降级，但我希望 331.89 能正常工作。
我使用“darktable -d opencl”作为测试也添加了指向 darktable 的符号链接，但这对 331.89 没有帮助