A symptom I've found, possibly unrelated, is that the gtweakui- galeon.desktop file references a /usr/share/gTweakUI/g.png path for the icon.
Clearly this won't work on a case sensitive file system. The following might help: changing the capitalization to /usr/share/gtweakui/g.png -- The icon for gtweakui is being displayed wrong https://launchpad.net/bugs/37990 -- universe-bugs mailing list universe-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/universe-bugs
