# blacklist of packages that should never be removed ubuntu-standard ubuntu-minimal ubuntu-desktop$ kubuntu-desktop xubuntu-desktop lubuntu-desktop mythbuntu-desktop ubuntustudio-desktop ubuntu-mate-core ubuntu-mate-desktop # ubuntu-release-upgrader should not remove itself or update-manager update-manager$ update-manager-core ubuntu-release-upgrader-core # postgresql (LP: #871893) ^postgresql-.*[0-9]\.[0-9].* # the upgrade runs in it ^screen$