Comment 66 for bug 762203

rajeshkunnoth, this is your post:
http://ubuntuforums.org/showthread.php?t=1754383

I have been collecting my various attempts to solve this problem in this post:
http://ubuntuforums.org/showthread.php?t=1838460&highlight=poweroff

A variety of different solutions have worked for many yet many others can find no solution. Is there no way other than trial & error to trouble shoot this problem? It seems like there should be some way to determine what blocks a computer from carrying out a power off command! For many of us this also makes it impossible to use Suspend and Hibernate. This is a significant annoyance for laptop users.