I just did a clean install of lubuntu 12.10 (amd64). If I try to remove a package (e.g., xpad) with apt-get remove xpad, apt-get wants to remove lubuntu-desktop as well as xpad. It doesn't matter what package I specify for the remove, apt-get always wants to remove lubuntu-desktop as well. I tried installing upgrades after the initial install. I rebooted. Same behavior with remove. I tried dist-installing upgrades. I rebooted. Same behavior with remove. I have previously installed lubuntu 12.10 from the same flash drive without having this problem. The current installation seems to work fine as long as I don't try to remove any packages.