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I've created a persistent linux installation using the often suggested method with the help of mkusb and installing the final system using the before-created partitioning scheme (see e.g. here: https://askubuntu.com/a/1107334/1043714 by @C.S.Cameron).

I now have doubt, that grub is installed correctly. When I edit /etc/default/grub (with e.g. some change in the timeout) and update-grub, I don't see any effect after reboot.

I suspect, it should put grub.cfg somewhere into /dev/sdx3 (which to my understanding is the acutal boot partition) instead of /dev/sdx5 (which is my actual / ) - but I'm not sure and additionally don't know, how EFI would come into play at this moment...

Thanks a lot in advance for guiding, pheidrias

pheidrias
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Update GRUB on Full Install USB made using mkusb

The method you point to has one instance of GRUB for BIOS and another for UEFI.

Running sudo update-grub will update GRUB on / only.

To fully update GRUB, after doing sudo update-grub, copy /boot/grub/grub.cfg from sdx5 to /boot/grub/grub.cfg on sdx3.

I will update that answer.

That answer was something I wrote on my way to making How to Create a Full Install of Ubuntu 20.04 to USB Device Step by Step

C.S.Cameron
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