Not really Android related, but I just upgraded to ubuntu 11.10 and had the re-install gnome (I hate Unity). All was pretty good but I just couldn't figure out how to get gnome-panel settings to show. Every report I found on the web says it was <alt>+<right click> but for me it is
Anyways, just though I'd add that, as I said, everywhere else says its <alt>+<right click>. Possibly the key binding was in use and it selected another.
On an Android note, if you are on Ubuntu 11.04 and having issues with eclipse (mouse not working!!) then do an upgrade to 11.10. All is good here.