Found how to fix that problem: for some reason clicking on "preferences" in the compizconfig manager disables the Unity plugin. Start Ubuntu with the 2D fallback mode, open the compizconfig settings manager again and enable the Unity plugin!
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/869840 Title: compizconfig-settings makes Unity dekstop unusable forever To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compizconfig-settings-manager/+bug/869840/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs