Installing from a CD ROM ubuntu 12.04.1 LTS. Boots properly asks for language, I select English. Moves to the next step where I select "Install server". Next step (step five on this page: http://www.ubuntu.com/download/help/install-ubuntu-server) asks again for language, but system is stuck. Does not respond no matter what keys I press. Problem happens after every reboot. Tried "check CD rom integrity" and came out "integrity test successful", but gets stuck right at that last successful notification window.