SOLVED: So the boot order was correct in UEFI, but for some reason CSM was disabled. Re-enabling that now causes GRUB to appear, and the PC boots into Linux without any other input. Thanks everyone!

I’ll look into these, thanks!

I don’t think I am, there shouldn’t be any temp ones. There are two options in bios, Windows bootloader and Linux Mint (listed as ubuntu). Win10 is on the top of the stack. I rearrange them to put linux on top, but when I hit save and exit it tells me no changes have been made. The Asus manual was not helpful, so it’s possible I’m missing something, just can’t figure out what.

Not 100%, but I’m not a BIOS/GRUB expert. When I restart my computer my options are currently either do nothing and let it automatically boot to Win10, or go to BIOS and manually select Linux. Manually selecting Linux takes me to the GRUB screen, which doesn’t appear at all when the computer boots to Win10. Does that information help?

I’m with you, I’ve been using RiF around a decade now. I’ll probably occasionally use old.reddit if I need help with a google search, but it won’t be something I reflexively check anymore. I hope all the fragmented communities can find each other again on here.