Gnome音量控制：HDA Intel(Alsa混音器)选项卡显示为灰色

要解决此问题，请打开终端并输入以下命令：

$ sudo apt-get install freedesktop-sound-theme

输出示例：

Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following extra packages will be installed:
  gnome-session-canberra
The following NEW packages will be installed:
  freedesktop-sound-theme gnome-session-canberra
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/307 kB of archives.
After this operation, 516 kB of additional disk space will be used.
Do you want to continue [Y/n]? y
Selecting previously deselected package freedesktop-sound-theme.
(Reading database ... 110172 files and directories currently installed.)
Unpacking freedesktop-sound-theme (from .../freedesktop-sound-theme_0.7.dfsg-1_amd64.deb) ...
Selecting previously deselected package gnome-session-canberra.
Unpacking gnome-session-canberra (from .../gnome-session-canberra_0.24-1_all.deb) ...
Setting up freedesktop-sound-theme (0.7.dfsg-1) ...
Setting up gnome-session-canberra (0.24-1) ...

现在，您可以根据需要禁用或设置主题。