This bug was fixed in the package zsys - 0.4.6

---------------
zsys (0.4.6) focal; urgency=medium

  [ Jean-Baptiste Lallement ]
  [ Didier Roche ]
  * Fix infinite GC loop (LP: #1870461)
  * Enhance timeout handling to avoid error rpc error: code = DeadlineExceeded
    desc = context deadline exceeded while the daemon is doing work
    (LP: #1875564)
  * Stop taking automated or manual snapshot when there is less than 20% of
    free disk space (LP: #1876334)
  * Enable trim support for upgrading users (LP: #1881540)
  * Only clean up previously linked user datasets when unlinked under USERDATA
    (LP: #1881538)
  * Strategy for deleted user datasets via a new hidden command called by
    userdel (LP: #1870058)
  * Get better auto snapshots message when integrated to apt (LP: #1875420)
  * Update LastUsed on shutdown via a new hidden command service call
    (LP: #1881536)
  * Prevent segfault immediately after install when zfs kernel module isn't
    loaded (LP: #1881541)
  * Don’t try to autosave gdm user (and in general non system user), even if
    systemd --user is started for them. (LP: #1881539)
  * Prevent apt printing errors when zsys is removed without purge
    (LP: #1881535)
  * Some tests enhancements:
    - new tests for all the above
    - allow setting a different local socket for debugging/tests purposes only
    - ascii order datasets in golden files
  * Typos and messages fixes. Direct prints are not prefixed with INFO
    anymore.
  * Refreshed po and readme with the above.

 -- Didier Roche <[email protected]>  Mon, 01 Jun 2020 09:26:52 +0200

** Changed in: zsys (Ubuntu Focal)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1881536

Title:
  Update LastUsed on shutdown

Status in zsys package in Ubuntu:
  Fix Released
Status in zsys source package in Focal:
  Fix Released

Bug description:
  [Impact]
  * When building other machines or when listing after a revert system states, 
ensure we present the correct order (snapshots taken on this filesystem dataset 
should be before the filesystem dataset itself, as it was used afterwards).
  * Minimize this by a new command, which only updates the LastUsed fields for 
used datasets on shutdown.
  * Shutdown is triggered with ExecStop on the service which updates it on 
boot, which is more coherent.
  * This is covered by new tests cases

  [Test Case]
  1. Run zfs get com.ubuntu.zsys:last-used <current root system dataset> -> 
note the time
  2. Shut down the machine
  3. Boot on another machine or on a live session
  4. Mount rpool
  5. Run zfs get com.ubuntu.zsys:last-used <current root system dataset> -> 
check the timestamp is newer that the first one noted.

  [Regression Potential]
  * A new hidden command is added, triggered when shutting down the zsys-commit 
service.
  * This is covered by new tests.

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