there is a tool called ppa-purge, install it. then you can remove each ppa individually by:
$ sudo ppa-purge ppa:unity-team/staging (for example) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1063647 Title: The lock screen doesn't work anymore To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/1063647/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
