Sorry, didn't mention earlier that this occurred in the Natty alternate install release of Fri, 22 Apr 2011 6:20:18 UTC.
The line
GRUB_GFXMODE=640x480
was commented out in /etc/default/grub
Uncommenting it and running update-grub fixed the problem.
Sorry, didn't mention earlier that this occurred in the Natty alternate install release of Fri, 22 Apr 2011 6:20:18 UTC.
The line
GRUB_GFXMODE= 640x480
was commented out in /etc/default/grub
Uncommenting it and running update-grub fixed the problem.