Problem:

Lancelot 2851 boots to a blank screen when running Ubuntu 12.04.3

Details:

Ubuntu uses the framebuffer instead of the regular VGA console. This doesn't work on the low end graphics adapter on this system.

Solution:

Add the following to /etc/default/grub:

GRUB_CMDLINE_LINUX_DEFAULT="vga=normal nomodeset"

Then update grub:

# update-grub2