OS: Ubuntu 14.04 (different Linux distros can have similar problem, so Google the appropriate commands for your specific distro)
Reinstall the packages from the standard Ubuntu Desktop that you removed:
sudo apt-get install ubuntu-desktop^
I started using Linux and Vim last Summer, and one of the first things I did in Vim, like I would do in any code editor, was to find a decent color scheme. I was surprised by how useful and colorful the terminal could be. Coming from Windows background, I realized how much I missed out. At first I was happy with the themes I found, but as I worked with less mainstream languages, most of the themes don’t work well enough. Or, some work on these languages but not on the others, so I had to switch theme based on the language I was programming, and it quickly became annoying. So, I decided to create my own color scheme.