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ZFS Unable to System Snapshot, bpool Is Full? Part 2

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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