My main complaint with Ubuntu 12.04 is that the upgrade from 11.10 breaks too many things, most importantly, GRUB and the display. I have upgraded on two computers now, and both required a tremendous amount of work to get anything to work at all (no graphics on one until I installed Icewm and booted to that, the other all the disk assignments were changed so would only give message "no such partition" after selecting any OS to boot).

Unless the install/upgrade is made to be flawless, I do not see how an ordinary user could ever accept it.