There is a hold on update-manager-kde try opening your terminal and issue the following command
𝒔𝒖𝒅𝒐 𝒂𝒑𝒕-𝒎𝒂𝒓𝒌 𝒖𝒏𝒉𝒐𝒍𝒅 𝒖𝒑𝒅𝒂𝒕𝒆-𝒎𝒂𝒏𝒂𝒈𝒆𝒓-𝒌𝒅𝒆 Then attempt to update the distro again. ** Changed in: update-manager (Ubuntu) Status: New => In Progress ** Changed in: update-manager (Ubuntu) Status: In Progress => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1400023 Title: LTS upgrade fails and reverts to previous state To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1400023/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs