Hello, Le 04/09/2020 à 18:00, Claude Robitaille a écrit :
I am copying a root FS on a different partition, hence the UUID needed to boot from that new partition is different. I am running grub-mkconfig on the main partition (with os-prober installed and the new partition mounted). The resulting /boot/grub/grub.cfg is perfect; the new partition menuentry is created as expected in the /etc/grub.d/30_os-prober section. Except for one glitch: every UUID referenced in that menuentry were updated EXCEPT the most important one; the linux kernel command line argument root= still has the original UUID. Manually updating it prove that the menuentry is otherwise Ok (by booting using it).
grub-mkconfig gets the kernel command line parameters from the foreign grub.cfg when it exists. You must update it with the new UUID when moving a system.
