A quick Google found the link below for installing the video drivers.
Not 100% apparently from the comments but an option to try. Says it's
for 12.04 but should work on 11.04 ( or you may decide to use 12.04
anyway due to the extended support as you'll be needing to upgrade
11.04 anyway before too long !! ).

daily.siebler.eu/.../ubuntu-12-04-driver-for-intel-cedarview-atom-n20\
00-und-d2000-serie/