Downloaded 15.04 today, put it on a USB drive, and tried to use the live version on both my laptop and desktop. It failed to boot to the desktop (showed Ubuntu loading screen though) on both with cryptic error messages and 30 minutes of Googling resulted in nothing that was helpful. I guess I'll do my ritual of trying and giving up again in another couple years. This is probably the 5th time I've tried installing Ubuntu. This is actually the worst time of the 5, in other instances I usually at least got it to the desktop but then ran into bugs that prevented decent usability and was never able to fix them after many many hours of trying to do so.