Lost power during install of MATE: how to recover?

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http://forums.fedoraforum.org – I tried to install MATE from Add/Remove Software, selecting MATE from the package collections. During the download/install there was a power outage. The result is something that is somewhat installed. When I log in, MATE is one of the sessions available. If I use it, it seems to mostly work but it is broken. What does not work is gnome-terminal. A window comes up but there is no command prompt. The title bar looks OK and the menu bar works. But the window itself is empty. Gnome-terminal still works fine in xfce and gnome sessions. Using Add/Remove Software I can't remove or install MAT (HowTos)