Error during upgrade to 0.8.1-1ubuntu14.2

[StephenTurley]

I was trying to run a package upgrade on my system today and it looks like zfsutils-linux was among the packages listed. My ZFS pool is mounted to /tank and is working both before and after this error. During the upgrade it seems that the system attempts to restart zfs-mount but fails because it is already mounted. Do I need to unmount the pool before doing the upgrade?

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
2 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Setting up zfsutils-linux (0.8.1-1ubuntu14.2) ...
zfs-import-scan.service is a disabled or a static unit not running, not starting it.
Job for zfs-mount.service failed because the control process exited with error code.
See "systemctl status zfs-mount.service" and "journalctl -xe" for details.
invoke-rc.d: initscript zfs-mount, action "restart" failed.
● zfs-mount.service - Mount ZFS filesystems
   Loaded: loaded (/lib/systemd/system/zfs-mount.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Fri 2019-11-22 11:36:51 EST; 4ms ago
     Docs: man:zfs(8)
  Process: 28041 ExecStart=/sbin/zfs mount -a (code=exited, status=1/FAILURE)
 Main PID: 28041 (code=exited, status=1/FAILURE)

Nov 22 11:36:51 stephen-desktop systemd[1]: Starting Mount ZFS filesystems...
Nov 22 11:36:51 stephen-desktop zfs[28041]: cannot mount '/tank': directory is not empty
Nov 22 11:36:51 stephen-desktop systemd[1]: zfs-mount.service: Main process exited, code=exited, status=1/FAILURE
Nov 22 11:36:51 stephen-desktop systemd[1]: zfs-mount.service: Failed with result 'exit-code'.
Nov 22 11:36:51 stephen-desktop systemd[1]: Failed to start Mount ZFS filesystems.
dpkg: error processing package zfsutils-linux (--configure):
 installed zfsutils-linux package post-installation script subprocess returned error exit status 1
dpkg: dependency problems prevent configuration of zfs-zed:
 zfs-zed depends on zfsutils-linux (>= 0.8.1-1ubuntu14.2); however:
  Package zfsutils-linux is not configured yet.

dpkg: error processing package zfs-zed (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                          Errors were encountered while processing:
 zfsutils-linux
 zfs-zed
E: Sub-process /usr/bin/dpkg returned an error code (1)

[StephenTurley]

I was able to run the upgrade by exporting my pool then importing after the upgrade. This seems fine, but I'm not sure if that is the expected behavior.