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update-grub fails saying it cannot find a device for /


From: Stefan Blachmann
Subject: update-grub fails saying it cannot find a device for /
Date: Sun, 14 Nov 2021 14:31:58 +0100

When I enter
# update-grub
I get an error message:
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).

/dev has been mounted before entering the chroot /mnt environment using
# mount --rbind /dev /mnt/dev

If I enter
# grub-probe
it answers:
No path or device is specified.

If I enter
# grub-probe /boot
it answers:
zfs

So, what do I need to do to make update-grub work?



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