[Expired for grub2 (Ubuntu) because there has been no activity for 60
days.]
** Changed in: grub2 (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1880414
why did you mount /dev/sda2 to /boot/grub? Can you undo that and try
again?
** Changed in: grub2 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1880414
The error in your log is:
grub-efi-amd64 (2.04-1ubuntu12.2) wird eingerichtet ...
x86_64-efi wird für Ihre Plattform installiert.
Installation beendet. Keine Fehler aufgetreten.
/usr/sbin/grub-probe: Fehler: Kanonischer Pfad von »rpool/ROOT/ubuntu_9ixsfh«
konnte nicht ermittelt werden.