When running the apt package manager from the command line, if it starts coming up with the following error when you’re running ZFS it’s likely that your disk is too full to take more snapshots. This is a process that happens automatically on package installation or update.

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<p>When running the apt package manager from the command line, if it starts coming up with the following error when you're running ZFS it's likely that your disk is too full to take more snapshots. This is a process that happens automatically on package installation or update.</p>
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In order to list your ZFS snapshots you can run

zfs list -t snapshot

To delete snapshots, as root, run either zfs destroy along with the specified snapshot name or delete a whole bunch at once:

zfs list -H -o name -t snapshot | xargs -n1 zfs destroy

For more information about zsys check out https://didrocks.fr/2020/06/04/zfs-focus-on-ubuntu-20.04-lts-zsys-state-collection/