Under Parallels 8 Desktop I have an Ubuntu 10.04 ne' 10.4 VM. Whenever I update, there is an invitation there to press a button and upgrade to 12.04. I pressed this button once under 10.04 and it was a disaster. Basically, I was left with a sort of Frankenstein labeled 10.4 but with the left hand launch bar on an 800 x 600 display which could not be modified. I rubbished the entire mess and restored my 10.4 VM. So the upgrade as promised couldn't have been easier, the result more goofy. I am thinking about just adding another VM and creating a brand new 12.04 installation. I have since heard about the 600 x 800 display gremlin. I wonder if that and other bugs await. I use my Linux VM mostly for personal geek fun and for some great Linux media conversion/manipulation tools.