I do not see unity (7.2.2+14.04.20140714-0ubuntu1) neither in trusty- proposed nor in trusty.
$ grep proposed /etc/apt/sources.list deb http://cz.archive.ubuntu.com/ubuntu/ trusty-proposed universe restricted multiverse main # archive.ubuntu.com tested too $ sudo apt-get update ... Reading package lists... Done $ sudo apt-cache policy unity unity: Installed: 7.2.1+14.04.20140513-0ubuntu2 Candidate: 7.2.1+14.04.20140513-0ubuntu2 Version table: *** 7.2.1+14.04.20140513-0ubuntu2 0 500 http://cz.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages 100 /var/lib/dpkg/status 7.2.0+14.04.20140423-0ubuntu1.2 0 500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages 7.2.0+14.04.20140416-0ubuntu1 0 500 http://cz.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages $ sudo apt-get -sV install unity/trusty-proposed Reading package lists... Done Building dependency tree Reading state information... Done E: Release 'trusty-proposed' for 'unity' was not found -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1320438 Title: Unity launcher auto hide fails on screen unlock using "Super+L" To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/1320438/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs