Re: How clean is upgrading from 10.04 to 12.04?
The main thing to watch out for is sometimes the way config files are written change when you upgrade to the new packages, the update will alert you if a config file is different than the one incoming and give you a chance to inspect and compare the files, modify it, keep yours or allow the new one to overwrite your old one.
I figure if it works then you saved yourself a new install and reconfiguration, if it doesn't, than you wasted a bit of your life and have to reinstall anyways. I think it's a good idea to torrent an iso and upgrade via the iso instead of over the network, repo servers get pretty clogged for about a week.
"You can't expect to hold supreme executive power just because some watery tart lobbed a sword at you"
"Don't let your mind wander -- it's too little to be let out alone."