I've reported the issue (I see on a dist-upgraded Powerbook G3 running gnome) to another bug number yesterday, looks much like a duplicate:
https://launchpad.net/distros/ubuntu/+bug/58382 -- Unable to start applications after hibernation https://launchpad.net/bugs/49221 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
