Comment 4 for bug 430272

I think I might a similar issue. Did a partial upgrade, and booting hangs with a blank screen after the progress bar reaches 100%. I pressed Esc and logged into the console. It seemed two packages were broken: initscripts and another package I can't remember the name of. The other package depended on mountall, which couldn't be found as a deb in any repos. Installed mountall using apt-get source mountall --compile, then dpkg -i ./mountall_x.y.z.deb, followed by apt-get install initscripts and the other package.

When I now reboot, Memtest86 is launched immediately. Nothing happens if I press Esc or F9 during boot. In fact, I'm not even sure it says "GRUB loading".