This bug was fixed in the package grub2 - 2.04-1ubuntu23
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grub2 (2.04-1ubuntu23) focal; urgency=medium
[ Jean-Baptiste Lallement ]
[ Didier Roche ]
* Performance improvements for update-grub on ZFS systems (LP: #1869885)
-- Didier Roche Tue, 31 Mar 2020 15:30:36 +0200
install ubuntu. then run boot-repair in terminal to fix this via liveusb
then try to reboot system. i fixed this and now i'm able to boot into
ubuntu 20.04.
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** Changed in: grub2 (Ubuntu)
Status: New => Triaged
** Changed in: grub2 (Ubuntu)
Importance: Undecided => Medium
** Changed in: grub2 (Ubuntu)
Assignee: (unassigned) => Jean-Baptiste Lallement (jibel)
** Also affects: grub2 (Ubuntu Focal)
Importance: Medium
Assignee: