My HP Pavilion zv5410us will boot from a Unbuntu 12.04 LTS Live CD, but it will not boot from my hard drive installation of the same system. It installed easily and is trying to use the nouveau driver, but I get a message telling me that "GPU Lockup - failed to idle channel 1". I know my GPU (Nvidia geForce4 440 Go) is not working properly because I can not use it's driver on Windows XP. Window XP will run OK on the vga.sys graphics system file. Does Ubuntu have a system file that emulates vga.sys?