Grub shows error: no device specified for hibernation

Do you use hibernation?

If you don’t, you could remove

resume=UUID=f13268f2-7920-4ce1-866f-b5ecc36ddb5b

from

GRUB_CMDLINE_LINUX_DEFAULT="resume=UUID=f13268f2-7920-4ce1-866f-b5ecc36ddb5b loglevel=3 nowatchdog nvme_load=YES"

in

/etc/default/grub

and run

sudo grub-mkconfig -o /boot/grub/grub.cfg

again.

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