I have tried a few different flavors of Ubuntu:
VMWare on Win 7 64bit, 12.04.1 32 bit
Virtualbox on WinXP 32bit, 12.04.1 64bit
Virtualbox on WinXP 32bit, 10.04 32bit
12.04.1 64bit native install on a laptop
All four configurations fail. Mostly for "command not found" or "No such file or...