Comment 20 for bug 67443

Thanks, Pischke!
Changing the depth has (for me) fixed this bug and the other one I was talking about, bug #66652

It's still a bit weird that the screen depth would have anything to do with the progress bars, but I guess it's a driver issue. I'm also not sure how it ended up at 24-bit, but I think it's always been like that. Perhaps an installer issue, then?
(Not really the hardware's fault; as long as the correct initial settings are chosen it's all good... although it would be cool if Ubuntu knew my hardware's limits and reported whenever I exceeded them).