Happened again. after 3 months, usually after a barrage of kernel upgrades. My previous post regarding this problem still applies. You have to remove old kernels. See my post
The problem persists because in Ubuntu zfs on root auto-snapshotting is turned on. You can list the snapshots
with this command:
# zfs list -r -t snapshot -o name,used,referenced,creation bpool/BOOT
Note: the REFER and USED columns in the output.
You can remove the oldest snapshots first with this command:
#
zfs list -H -r -t snapshot -o name,used,referenced,creation bpool/BOOT | head -n 5 | cut -c 35-40 | xargs -n 1 sudo zsysctl state remove --system
This command removes the oldest 5 snapshots. You can repeat the command to remove more.
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