I had Ubuntu Gnome 13.10. installed, but it wasn't very stable, so I installed Ubuntu LTS 12.04 in its place, removing everything from /, but keeping /home.
Now I have several, but possibly related problems. A list of things I have noticed thus far:
- I cannot change the background picture. It simply won't change regardless of what is chosen from the menu.
- Changes to Unity sidebar do not persist between logins. The default icons return at every login.
- Changes to Deja dup do not happen - if I open the settings panel and close it again, the changes are gone. Backup can be started, but does nothing.
I tried removing settings from the desktop, but returning everything to default settings did just that, without removing the problem.
However, I have no problems installing new software or changing Compiz settings or having those persist.
This is only a partial solution, but since I did not manage to find the specific files responsible for the problems, but I removed all config files from /home and the problem was gone. First, of course, I got copies of everything. I could test and see where the problem was, but that would take a lot of work.