I just installed the Gnome Tweak Tool in order to change my icon theme to Faenza, but it seems to have installed some other program named Caribou, which I think is an onscreen keyboard program, with it. This is absolutely useless for me, and frankly, I hate the fact that it was installed silently and without my permission. When I go to uninstall it, it says that it's part of gnome-shell and requires the un-installation of that as well. What do I do?