In my case, a seemingly plain-vanilla, straightforward upgrade from Ubuntu 10.04 LTS on Ubuntu-supported hardware (leo1 from System76) to Ubuntu 12.04 resulted in an inability to boot into anything more than GRUB, and also (once the system was booted) no DNS.
In my case, a seemingly plain-vanilla, straightforward upgrade from Ubuntu 10.04 LTS on Ubuntu-supported hardware (leo1 from System76) to Ubuntu 12.04 resulted in an inability to boot into anything more than GRUB, and also (once the system was booted) no DNS.
I detail my successful fix, and the process getting there, here: http:// chrismbalz. typepad. com/computerbur n/2012/ 05/rough- upgrade- from-ubuntu- 1004-lts- to-1204- lts.html