我安装了 gnome tweak 工具，并尝试设置自定义主题等。因此，尝试安装 gnome-shell-extensions-user-theme。
me@computer:~$ sudo apt-get install gnome-shell-extensions-user-theme
[sudo] password for me:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
gnome-shell-extensions-user-theme : Depends: gnome-shell-extensions-common but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
无法安装？好的，我们来看看……
me@computer:~$ sudo apt-get install gnome-shell-extensions-common
Reading package lists... Done
Building dependency tree
Reading state information... Done
gnome-shell-extensions-common is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
等等，什么？软件包损坏了？哇！我觉得这可能是 PPA 矛盾问题或其他问题，但我厌倦了破坏我的安装。有点不知所措。有什么想法吗？
输出sudo apt-get install -f
drex@U110:~$ sudo apt-get install -f
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
答案1
是的……今天又发生了这种情况。这个输出告诉你，开发人员又开始开发 gnome-shell，所以你应该在这样的日子里更频繁地在终端中查找更新。
然后在获得更新和升级后，转到您的 Synaptic，完全刷新它，然后尝试安装。
如果再次出现此输出，则您只需等待稍后的时间...