Upgrade from Xubuntu 11.10 to 12.04 stopped by xscreensaver

[Charlie Kravetz]

While upgrading from Xubuntu 11.10 to 12.04, my computer stopped doing anything for 12 hours. Clicking on "terminal" in the update manager, I found a message that "xscreensaver or xflock is running and needs to be stopped". Had I not clicked terminal, the upgrade would have failed, and the system would then require a complete, fresh installation. There is no indication that there is a hidden message, if the user does not know to click terminal and look, the messge is never seen. Unfortunately, I have not run upgrades in a while, and forgot to turn off xscreensaver.