Ubuntu 18.04 gnome-session 损坏的安装后脚本

在 Ubuntu 18.04 的最小安装中，我尝试通过运行以下命令切换到香草 gnome 桌面： sudo apt-get install vanilla-gnome-desktop

由于此错误，此安装失败。此问题导致所有 apt-get install 和 apt-get upgrade 失败。

我尝试使用以下命令删除损坏的软件包，但无济于事：

hugh@xps:~$ sudo apt install -f
Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up gnome-session (3.28.1-0ubuntu3) ...
update-alternatives: error: cannot stat file '/etc/alternatives/gdm3.css': Invalid argument
dpkg: error processing package gnome-session (--configure):
 installed gnome-session package post-installation script subprocess returned error exit status 2
Errors were encountered while processing:
 gnome-session
E: Sub-process /usr/bin/dpkg returned an error code (1)

和：

hugh@xps:~$ sudo dpkg --remove --force-remove-reinstreq gnome-session
(Reading database ... 166375 files and directories currently installed.)
Removing gnome-session (3.28.1-0ubuntu3) ...
update-alternatives: error: cannot stat file '/etc/alternatives/gdm3.css': Invalid argument
dpkg: error processing package gnome-session (--remove):
 installed gnome-session package pre-removal script subprocess returned error exit status 2
Errors were encountered while processing:
 gnome-session

和

hugh@xps:~$ sudo apt-get install --reinstall gnome-session
Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 to upgrade, 0 to newly install, 1 reinstalled, 0 to remove and 0 not to upgrade.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
E: Internal Error, No file name for gnome-session:amd64