I just upgraded to 12.04 and gnome shell extensions have all stopped working. I have removed all the installed ones from both directories and logged in again, but when I go to extensions.gnome.org there are no extensions listed at all? so nothing to install.

I really think that Ubuntu is losing it. Every release is worse than the previous one. It used to be that I looked forward to updates to see what great new things were available. Now it is something I loath as it always breaks vital things. In this case I lost wifi and my desktop on a very common laptop - how can they seriously call this a LTS version?