Happened to me again, the only way out I guess is logging out & back again. Even doing a killall for apt apt-get aptitude doesn't get me anywhere although I know its bad practise to do killall for package managers. This happens to me during sudo aptitude upgrade & not update. Doing a
sudo lsof | grep /var/lib/apt/lists/lock gave me this:- apt-get 5403 root 5uW REG 8,17 0 1075198 /var/lib/apt/lists/lock -- Update Manager stops updating from repositories. https://bugs.launchpad.net/bugs/111933 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs