RE System76 - Lawence wrote...

> But yes, when I first got it, it would boot immediately, without showing any boot menu.

From my recollection...

If I have a single partition drive with Ubuntu on it, then on power on I won't get a grub menu. Pressing the shift key after power-on should invoke the grub menu. (...but not always)

If I add a second partition and place ubuntu onto it, then on power on I will always get the grub menu. The grub menu will default to booting the second partition as that was the most recent partition installed. i.e. It was the partition that last ran the grub-mkconfig utility.

Some links;  here, here and here to gummiboot, an open-source boot manager, now the systemd-boot component of systemd.

cheers, Ian.