首先，我先做了什么？首先，我在 Ubuntu 16.04 中安装了 gnome 桌面环境，然后我使用以下方法安装了 KDE plasma：
sudo add-apt-repository ppa:kubuntu-ppa/backports
sudo apt-get update && sudo apt-get dist-upgrade
sudo apt-get install kubuntu-desktop
然后使用以下方法删除 gnome本网站上述站点的第一个答案，但我无法使用命令重新安装：ubuntu unity；
sudo apt-get install ubuntu-desktop
sudo apt-get install unity
终端显示的错误是这样的：
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: checkbox-gui but it is not going to be installed
Recommends: python3-aptdaemon.pkcompat but it is not going to be installed
Recommends: qt-at-spi but it is not going to be installed
Recommends: sni-qt 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.
我已经使用 synaptic 删除了 KDE，并且还尝试过这，两种解决方案。但字体仍然与以前不同，并且在打开 Ubuntu 时，我没有看到典型的 Ubuntu 符号，而是看到 Gnome 符号。
编辑：安装 checkbox-gui 时；
sudo apt-get install checkbox-gui
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
注意：我有 Windows 7 双启动