I recently just installed the gnome3 D.E. on ubuntu 11.04 after and once i did all my permissions got messed up. It won't let me open dropbox and says it's because of a permissions error. Also when i try to change the theme folder in gnome-shell it won't let me because of the same reason.
Maybe your user files are now owned by root. Try figuring out the user with the
In case it looks like
you can try to claim ownership of all the files by doing
For a complete fix, you would then have to do