Interesting progress... I did another update of the system (there wasn't plymouth in the list) but now I can see the non-flickering white/blue line at the bottom (well, it is actually black/blue because of different colour mapping?) and can press Enter without freeze.
Among others, there was new kernel 2.6.32-13.18 installed and gdm updated from 2.29.6-0ubuntu2 to 2.29.6-0ubuntu3 -- Pressing <Enter> causes X to freeze https://bugs.launchpad.net/bugs/516412 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs