I upgraded on my generic 64bit Intel desktop machine, upgrade was smooth.
Just went to the System, Update Manager and clicked on the upgrade manager. Took a couple of hours to download the latest bits. Installation went smooth which took around 45 minutes. It cleaned up all the obselete packages and finally rebooted and login, everything was fine.
After a few minutes, the machine hang with keyboard or mouse not working. Still not sure what is the problem. Investigating.... Once found a solution will post here. If anyone found a solution please post here too, thanks.

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I found out why keyboard /mouse not working. The machine doesn't hang, it is still there. PS/2 mouse / keyboard doesn't work. Once i connected back a USB keyboard / mouse and now everything is good. Looks like PS/2 support is gone, but that is not a big deal. Overall upgrade looks good.
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