Ubuntu 10.04 doesn't boot after upgrade from 9.10

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http://www.ubuntux.org – I just upgraded from Ubuntu 9.10 to 10.04 and immediately had some problems with booting after a restart. Here is a video but I will explain it anyway: http://www.youtube.com/watch?v=aEr7glFLf48 The font changed suddenly during startup, and then the screen flashed, and the logo appeared but then became what I would call pixelated. Then all I got was a black screen and it just hung there. Did a hard restart and entered the GRUB loader and chose Ubuntu 10.04 k (Distributions)