Error suggest that your /etc/default/grub file is 'broken' (to some degree anyway), little we can do about that from a package POV I am afraid :/
** Changed in: kubuntu-default-settings (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/923976 Title: package plymouth-theme-kubuntu-logo 1:12.04ubuntu2 failed to install/upgrade: subprocess installed post-removal script returned error exit status 2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kubuntu-default-settings/+bug/923976/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs