我安装了一些软件包，要查看已安装软件包的列表，请参见此处。在登录之前，我从办公桌前走开，锁上了计算机并返回黑屏。
我搜索了谷歌，发现这告诉我重新启动服务，因此我将sudo service lightdm --full-restart其打开进入登录屏幕，输入密码，然后登录到黑屏，上面带有科莫多图标和鼠标光标。所以我搜索更多一些，发现这个和这个。尝试了所有这些，没有任何反应。
因此，我假设我将不得不重新安装Ubuntu桌面或从备份运行。我在运行时遇到的唯一问题sudo apt-get install ubuntu-desktop --reinstall是一堆unable to correct problems, you have held broken packages：
The following packages have unmet dependencies:
ubuntu-desktop : Depends: software-center but it is not going to be installed
Depends: ubuntu-sso-client but it is not going to be installed
Depends: unity but it is not going to be installed
Recommends: bluez-alsa but it is not going to be installed
Recommends: empathy but it is not going to be installed
Recommends: firefox but it is not going to be installed
Recommends: gnome-disk-utility but it is not going to be installed
Recommends: gnome-orca but it is not going to be installed
Recommends: landscape-client-ui-install but it is not going to be installed
Recommends: pulse-audio-module-x11 but it is not going to be installed
Recommends: python3-aptdaemon.pkcompat but it is not going to be installed
Recommends: totem-mozilla but it is not going to be installed
Recommends: ttf-punjabi-fonts but it is not going to be installed
Recommends: vino but it is not going to be installed
E: Unable to correct problems, you have held broken packages
这些听起来都很重要，并且好像它们应该已经安装了，所以我的问题很简单，我现在想做什么呢？我如何才能成功解决此问题？
首先通过清除缓存sudo apt-get autoremove && sudo apt-get clear cache，然后键入sudo apt-get update && sudo apt-get upgrade。我认为这肯定会起作用。
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