Thanks for reporting. Please run: apport-collect 707392
To gather system info. Also attach your sources.list: (Located on desktop after running following command.) cat /etc/apt/sources.list > ~/Desktop/Sources ** Changed in: update-manager (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/707392 Title: Not possible to upgrade untrusted packages -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs