问题

升级后，Ubuntu桌面GUI无法正常工作，并且经常卡死。

我也尝试过 sudo apt-get install ubuntu-desktop 但是得到如下结果。

The following packages have unmet dependencies:


 ubuntu-desktop : Depends: checkbox-gui but it is not going to be installed


 Recommends: python3-aptdaemon.pkcompat but it is not going to be installed


 Recommends: unity-webapps-common but it is not going to be installed


E: Unable to correct problems, you have held broken packages.

我尝试安装checkbox-gui，然后它给出另一个未满足的依赖项错误

答案1

下面的命令解决了问题， unity --replace sudo apt-get install --reinstall unity sudo dpkg --configure -a sudo apt-get update sudo apt-get upgrade -y

答案2

总是用ppa-purge删除PPA

sudo add-apt-repository ppa:kubuntu-ppa/backports


sudo apt-get update && sudo apt-get dist-upgrade


sudo apt-get install kubuntu-desktop

一小时后，我决定切换回Unity，并删除KDE：

sudo add-apt-repository --remove ppa:kubuntu-ppa/backports


sudo apt-get update && sudo apt-get dist-upgrade


sudo apt-get remove --purge kubuntu-desktop

登录后遇到一些问题，所以，我尝试重新安装ubuntu-desktop和unity，但是，我得到错误：

The following packages have unmet dependencies:


 ubuntu-desktop : Depends: checkbox-gui but it is not going to be installed


 Recommends: python3-aptdaemon.pkcompat but it is not going to be installed


 Recommends: unity-webapps-common but it is not going to be installed


E: Unable to correct problems, you have held broken packages.

我发现了原因：删除PPA不会降级软件包，解决方案是再次添加它，并执行：

sudo apt-get install ppa-purge


sudo ppa-purge ppa:kubuntu-ppa/backports

然后我可以重新安装ubuntu-desktop：