I'm currently on a mac. When I installed Ubuntu in the first place I created a bootable thumb drive, rebooted, held alt, chose the thumb drive, and that was about it.
I've decided I would like to give Mint a test run, so I did the same thing, but now this method doesn't work. If I reboot and hold alt, my thumb drive shows up fine. But if I choose it, Ubuntu starts. And that's it.
To my knowledge, Ubuntu should have nothing at all to do with anything once I've gone through the trouble of choosing a different boot drive/disk/medium. If anything goes wrong at all, I would hope for a black screen of death or something that looks like terminal. Not the OS I specifically chose not to boot.
What on earth is going on here?
P.S. This post is why I'm pretty sure I should be able to continue using the method above.
I'm not sure if grub has anything to do with it, but I'm looking here now: https://help.ubuntu.com/community/BootFromUSB