I can't seem to push the resolution of Ubuntu past 800x600. I have given it 128 MB video RAM (max) and HW acceleration, and gave it 4 cores and 1 GB RAM.
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Have you installed Guest Additions within the guest operating system? That enables better resolution amongst other things:
http://www.dedoimedo.com/computers/virtualbox-guest-addons.html
http://www.virtualbox.org/wiki/VirtualBox
http://forum.notebookreview.com/showthread.php?t=436427
Ubuntu and VirtualBox
Discussion in 'Linux Compatibility and Software' started by fred2028, Nov 23, 2009.