No, I didn't. I performed only the steps I listed. I've since rebooted, and metacity has launched as normal: the update appears to have fixed the problem, hence this was a duplicate. Thanks Sebastien and Christian for your help :)
-- metacity doesn't launch https://bugs.launchpad.net/bugs/113266 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is a bug contact for metacity in ubuntu. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs