I installed Ubuntu from Windows. When it tried to reboot, the computer started with the following text on the screen:
init: segfault at .... kernel panic - not syncing. Attempted to kill init! ... .... panic occurred, switching back to text console
The computer then failed to start until I rebooted from a boot CD. It then opened normally in Windows.
I installed from: ubuntu.com/download/desktop/windows-installer Ubuntu Desktop 12.04 LTS
My hardware is as follows:
OS Name: Microsoft Windows 7 Professional Version: 6.1.7601 Service Pack 1 Build 7601 Processor: Pentium(R) Dual-Core CPU E5500 @ 2.80GHz, 2803 Mhz, 2 Core(s), 2 Logical Processor(s) Video controller: NVIDIA GeForce 8400 GS
I have not tried rebooting again.