I just did by following the instruction on Ubuntu website but then the system refused to boot.
Later I found that it's a problem on grub, and by following the instructions here:
http://ubuntuforums.org/showthread.php?t=1581099
The problem was solved finally.
By sticking to LTS should be better but then upgrading between LTS should be more carefully since you're jumping between some major releases.
Tuesday, January 31, 2012
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