I'm surprised the snapshots showed up, I've got the snapdirs hidden:
$ zfs list -oname,snapdir
NAME SNAPDIR
bpool hidden
bpool/BOOT hidden
bpool/BOOT/ubuntu hidden
rpool hidden
rpool/ROOT hidden
rpool/ROOT/ubuntu hidden
rpool/home hidden
rpool/home/root hidden
rpool/home/sarnold hidden
rpool/swap -
rpool/tmp hidden
rpool/usr hidden
rpool/usr/local hidden
rpool/var hidden
rpool/var/cache hidden
rpool/var/lib hidden
rpool/var/lib/AccountsService hidden
rpool/var/lib/docker hidden
rpool/var/lib/nfs hidden
rpool/var/lib/schroot hidden
rpool/var/log hidden
rpool/var/mail hidden
rpool/var/snap hidden
rpool/var/spool hidden
rpool/var/tmp hidden
rpool/var/www hidden
** Also affects: initramfs-tools (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1860762
Title:
Upgrade with zfs-on-root failures
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