This line exists because I sometimes used sudo grub-reboot 0 in order to reboot into Ubuntu. Update: I've been checking out the GRUB config files and noticed that there is one file called /boot/grub/grubenv which has an entry named next_entry=. Or is there (hopefully) a tool where I can just place a file on the Stick/Card which is then read by GRUB? Would I need to (somehow, I wouldn't know how) install/copy/dd GRUB onto the USB-Stick/SD-Card and select it to be the first item in the BIOS's boot order, with a fallback to Ubuntu's partition, which is currently the first in the boot order? If it is inserted, it should boot into Ubuntu (the first entry), if not, then it should use the default selection (the third entry, Windows). I would like to be able to use a USB stick (or maybe better a SD-Card) in order to change the default selection. The active partition (first boot item in BIOS) is the one where Ubuntu is installed on, and I've manually entered entries to GRUB to have Windows as a selection to boot into, which is set as the default. I have a machine which has Windows and Ubuntu 20.04 on it.
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