我试图通过输入命令来删除 python3 sudo apt-get remove python3，但现在整个系统都崩溃了。我尝试了在网上找到的多种解决方案，例如重新安装ubuntu-descktop。
sudo apt install --reinstall ubuntu-desktop
结果：
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:
ubuntu-desktop : Depends: gdm3 but it is not going to be installed
Depends: gnome-control-center but it is not going to be installed
Depends: gnome-shell but it is not going to be installed
Depends: gnome-shell-extension-appindicator but it is not going to be installed
Depends: gnome-shell-extension-desktop-icons but it is not going to be installed
Depends: gnome-shell-extension-ubuntu-dock but it is not going to be installed
Depends: ubuntu-desktop-minimal but it is not going to be installed
Depends: ubuntu-session but it is not going to be installed
Depends: yelp but it is not going to be installed
Recommends: gnome-getting-started-docs but it is not going to be installed
Recommends: ibus
Recommends: ibus-table but it is not going to be installed
Recommends: plymouth-theme-spinner but it is not going to be installed
Recommends: ubuntu-docs but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
我也尝试手动重新安装依赖项，但没有效果。