here's an alternate approach:
sudo apt-get install xvfb xfonts-100dpi xfonts-75dpi xfstt
Edit /etc/default/grub, and set:
GRUB_GFXMODE=1600x1200,1280x1024,800x600
GRUB_PAYLOAD_LINUX=keep
sudo update-grub
Restart the HVM.
Obviously, use resolutions that work for you. (You may find that only
the FIRST in that list is active and available.)