[ubuntu] Can't boot 10.10 after recommended updates

I have Ubuntu 10.10 but I can only use Windows 7 now (I hate it). Here's why: when I go to the boot screen and I am given the choice of using Windows 7 or Ubuntu and I select Ubuntu, the screen goes black and says:

error: unknown command 'loadfont'
error: file not found

Then I have to reset...