Is your rpool mirrored?
On a test enviroment if I detach one of the drives, I can run update-
grub. Reattaching the drive breaks update-grub.
I'm currently stuck in 19.04 because of this bug.
# zpool status
pool: zroot
state: ONLINE
scan: scrub repaired 0B in 2h59m with 0 errors on Sun Oct 13 03:23:12 2019
config:
NAME STATE READ WRITE CKSUM
zroot ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
sda3 ONLINE 0 0 0
sdb3 ONLINE 0 0 0
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https://bugs.launchpad.net/bugs/1848856
Title:
Upgrade from 19.04 to 19.10 with zfs on root fails with grub syntax
error
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