我有一个音频文件，其中一个部分在 Audacity 中以高缩放级别看起来像这样：
当然，这里的音频中会发出咔嗒声。我相信，如果我可以将这几个音频样本移动到更接近基线的位置，我可以显着减轻它，但我找不到在 Audacity 中做到这一点的方法。是否可以？还有其他软件可以帮助我做到这一点吗？
一段时间以来，我已经注意到我的 Firefox 没有“重启”图标。安装 Firefox 更新后，我看到的是“缺少图标”图标：
当我点击这个图标时，我会看到正常的“你应该重新启动 Firefox”弹出窗口，只是这个图标有一个更大、更模糊的版本。
我正在使用最新的 Kubuntu 14.04 和一些扩展（其中包括“经典主题恢复程序”），但很难确定是否有一个扩展是罪魁祸首，因为如果我禁用了某些扩展，我必须重新启动 Firefox生效了，然后图标就明显没了，只能等下次更新了。尝试使用新的默认配置文件也很困难。
我试过清除并重新安装 firefox，但显然没有效果，但也许我错过了一些东西。
（编辑作为答案发布）
我很高兴在 Kubuntu 14.04 上使用 TP-LINK TL-WN722N USB wifi 适配器。现在它突然停止工作了。当我插入它时，/var/log/syslog 会显示如下内容：
Sep 30 20:34:08 meles kernel: [47010.291060] usb 3-2: new high-speed USB device number 13 using xhci_hcd
Sep 30 20:34:08 meles kernel: [47010.319034] usb 3-2: New USB device found, idVendor=0cf3, idProduct=9271
Sep 30 20:34:08 meles kernel: [47010.319049] usb 3-2: New USB device strings: Mfr=16, Product=32, SerialNumber=48
Sep 30 20:34:08 meles kernel: [47010.319055] usb 3-2: Product: USB2.0 WLAN
Sep 30 20:34:08 meles kernel: [47010.319059] usb 3-2: Manufacturer: ATHEROS
Sep 30 20:34:08 meles kernel: [47010.319063] usb 3-2: SerialNumber: 12345
Sep 30 20:34:08 meles kernel: [47010.320884] usb 3-2: ath9k_htc: Firmware htc_9271.fw requested
Sep 30 20:34:08 meles ModemManager[802]: <warn> Couldn't find support for device at '/sys/devices/pci0000:00/0000:00:1c.2/0000:02:00.0/usb3/3-2': not supported by any plugin
Sep 30 20:34:08 meles kernel: [47010.784766] usb 3-2: ath9k_htc: Transferred FW: htc_9271.fw, size: 51272
Sep 30 20:34:08 meles kernel: [47011.020822] ath9k_htc 3-2:1.0: ath9k_htc: HTC initialized with 33 credits
Sep 30 20:34:09 meles kernel: [47011.250691] ath9k_htc 3-2:1.0: ath9k_htc: FW Version: 1.3
Sep 30 20:34:09 meles kernel: [47011.250701] ath: EEPROM regdomain: 0x809c
Sep 30 20:34:09 meles kernel: [47011.250704] ath: EEPROM indicates we should expect a country code
Sep 30 20:34:09 meles kernel: [47011.250708] ath: doing EEPROM country->regdmn map search
Sep 30 20:34:09 meles kernel: [47011.250711] ath: country maps to regdmn code: 0x52
Sep 30 20:34:09 meles kernel: [47011.250715] ath: Country alpha2 being used: CN
Sep 30 20:34:09 meles kernel: [47011.250717] ath: Regpair used: 0x52
Sep 30 20:34:09 meles kernel: [47011.254919] ieee80211 phy15: Atheros AR9271 Rev:1
Sep 30 20:34:09 meles NetworkManager[1076]: <info> (wlan1): using nl80211 for WiFi device control
Sep 30 20:34:09 meles NetworkManager[1076]: <info> (wlan1): driver supports Access Point (AP) mode
Sep 30 20:34:09 meles NetworkManager[1076]: <info> (wlan1): new 802.11 WiFi device (driver: 'ath9k_htc' ifindex: 18)
Sep 30 20:34:09 meles NetworkManager[1076]: <info> (wlan1): exported as /org/freedesktop/NetworkManager/Devices/16
Sep 30 20:34:09 meles NetworkManager[1076]: <info> (wlan1): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Sep 30 20:34:09 meles NetworkManager[1076]: <info> (wlan1): bringing up device.
Sep 30 20:34:09 meles kernel: [47011.344907] usb 3-2: USB disconnect, device number 13
Sep 30 20:34:09 meles kernel: [47011.843938] ath: phy15: Chip reset failed
Sep 30 20:34:09 meles kernel: [47011.843951] ath: phy15: Unable to reset channel (2412 Mhz) reset status -22
Sep 30 20:34:09 meles kernel: [47011.843980] ath: phy15: Unable to set channel
Sep 30 20:34:09 meles kernel: [47011.945316] ath: phy15: RX failed to go idle in 10 ms RXSM=0xeaffffff
Sep 30 20:34:09 meles kernel: [47011.946506] IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready
Sep 30 20:34:09 meles kernel: [47011.955443] ath: phy15: Failed to wakeup in 500us
Sep 30 20:34:09 meles kernel: [47012.056695] ath: phy15: RX failed to go idle in 10 ms RXSM=0xe41da337
Sep 30 20:34:09 meles kernel: [47012.066754] ath: phy15: Failed to wakeup in 500us
Sep 30 20:34:09 meles kernel: [47012.168010] ath: phy15: RX failed to go idle in 10 ms RXSM=0xe41da337
Sep 30 20:34:10 meles kernel: [47012.192423] ath: phy15: Failed to wakeup in 500us
Sep 30 20:34:10 meles kernel: [47012.293854] ath: phy15: RX failed to go idle in 10 ms RXSM=0xb872752f
Sep 30 20:34:10 meles kernel: [47012.699081] ath: phy15: RX failed to go idle in 10 ms RXSM=0xb872752f
Sep 30 20:34:10 meles NetworkManager[1076]: <warn> (18) failed to find interface name for index
Sep 30 20:34:10 meles NetworkManager[1076]: (nm-system.c:766):nm_system_iface_get_flags: runtime check failed: (iface != NULL)
Sep 30 20:34:10 meles NetworkManager[1076]: <error> [1443638050.555454] [nm-system.c:768] nm_system_iface_get_flags(): (unknown): failed to get interface link object
Sep 30 20:34:10 meles NetworkManager[1076]: <warn> (18) failed to find interface name for index
Sep 30 20:34:10 meles NetworkManager[1076]: (nm-system.c:766):nm_system_iface_get_flags: runtime check failed: (iface != NULL)
Sep 30 20:34:10 meles NetworkManager[1076]: <error> [1443638050.555961] [nm-system.c:768] nm_system_iface_get_flags(): (unknown): failed to get interface link object
Sep 30 20:34:10 meles NetworkManager[1076]: <warn> (18) failed to find interface name for index
Sep 30 20:34:10 meles NetworkManager[1076]: (nm-system.c:766):nm_system_iface_get_flags: runtime check failed: (iface != NULL)
Sep 30 20:34:10 meles NetworkManager[1076]: <error> [1443638050.556434] [nm-system.c:768] nm_system_iface_get_flags(): (unknown): failed to get interface link object
Sep 30 20:34:10 meles NetworkManager[1076]: <warn> (18) failed to find interface name for index
Sep 30 20:34:10 meles NetworkManager[1076]: (nm-system.c:766):nm_system_iface_get_flags: runtime check failed: (iface != NULL)
Sep 30 20:34:10 meles NetworkManager[1076]: <error> [1443638050.557402] [nm-system.c:768] nm_system_iface_get_flags(): (unknown): failed to get interface link object
Sep 30 20:34:10 meles NetworkManager[1076]: <warn> (18) failed to find interface name for index
Sep 30 20:34:10 meles NetworkManager[1076]: (nm-system.c:766):nm_system_iface_get_flags: runtime check failed: (iface != NULL)
Sep 30 20:34:10 meles NetworkManager[1076]: <error> [1443638050.557948] [nm-system.c:768] nm_system_iface_get_flags(): (unknown): failed to get interface link object
Sep 30 20:34:10 meles ModemManager[802]: <info> (net/wlan1): released by modem /sys/devices/pci0000:00/0000:00:1c.2/0000:02:00.0/usb3/3-2
Sep 30 20:34:10 meles NetworkManager[1076]: <warn> (18) failed to find interface name for index
Sep 30 20:34:10 meles NetworkManager[1076]: (nm-system.c:766):nm_system_iface_get_flags: runtime check failed: (iface != NULL)
Sep 30 20:34:10 meles NetworkManager[1076]: <error> [1443638050.558456] [nm-system.c:768] nm_system_iface_get_flags(): (unknown): failed to get interface link object
Sep 30 20:34:10 meles NetworkManager[1076]: <warn> (18) failed to find interface name for index
Sep 30 20:34:10 meles NetworkManager[1076]: (nm-system.c:766):nm_system_iface_get_flags: runtime check failed: (iface != NULL)
Sep 30 20:34:10 meles NetworkManager[1076]: <error> [1443638050.559112] [nm-system.c:768] nm_system_iface_get_flags(): (unknown): failed to get interface link object
Sep 30 20:34:10 meles NetworkManager[1076]: <warn> (18) failed to find interface name for index
等等
它工作正常，然后我更新了内核（我猜还有一些其他的东西），拔下它，重新启动，但它不再工作了。我尝试使用以前的内核启动，但没有任何乐趣。我在另一台电脑上试过，它也曾在那里工作（但自从我上次在那里尝试以来已经更长了），它是一样的。
设备中没有任何东西亮起，我怀疑它可能有问题，而不是操作系统。我还能做些什么来找出问题所在吗？
我刚刚将 Kubuntu 从 12.04 升级到 14.04，并且（如预期的那样）有几个烦恼。我尝试但未能解决的第一个问题是每当我使用调音台或音量键更改音量时播放的“爆裂”声。我已经受够了 OSD，我不需要任何声音。
我在通知设置中选择了“无音频”，但这没有帮助。
我注意到的其他事情，但不记得以前是这样的：显示系统托盘菜单时，音量键不起作用......