I installed the Gimp through the Software Center and it had to undo something. I lost LibreOffice, for example.
Then when I was done with the Gimp, I uninstalled it and tried to get my other stuff back. Now my desktop has no control bar on the left. Nor can I see the top bar. I can access the terminal though.
How can I undo all of what the Gimp removed and restore the previous settings?