If I insert the USB drive with the Void Linux live system, then t boots.  OK, that probably uses syslinux and not GRUB.  Installing GRUB on the hard drive [/dev/sda] always works, so why not /dev/sdb?

On Tuesday, June 25, 2019 at 11:39:15 AM UTC+1, space pudim wrote:
> My laptop is setup so that it tries USB first, then reverts to hard drive if no suitable USB device is present.

Oh yes, I've faced this in the past too. Some computers have a boot
menu, and you have to boot your drive from there, otherwise it won't
work, even if you put USB boot on the BIOS setup. Just like the "press
delete to enter setup", some have a "press f8 (or f12 or some other
key) to enter boot menu".

--
Pudding

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