This is the problem:
'/var/share': directory is not empty

Figure out what is in there and deal with this appropriately.

I don't personally love that ZFS refuses to mount on non-empty
directories, but most of the time, the fact that the directory is non-
empty is the real problem.

** Changed in: zfs-linux (Ubuntu)
       Status: New => Incomplete

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  ZoL: wrong import order prevents boot

Status in zfs-linux package in Ubuntu:

Bug description:
  I've the following zfs:

  # zfs list -r rpool/VARSHARE
  NAME                              USED  AVAIL  REFER  MOUNTPOINT
  rpool/VARSHARE                           114K   165G    30K  /var/share
  rpool/VARSHARE/lxc                        84K   165G    19K  /var/share/lxc
  rpool/VARSHARE/lxc/xenial                 65K   165G    19K  
  rpool/VARSHARE/lxc/xenial/pkg             19K   165G    19K  
  rpool/VARSHARE/lxc/xenial/rootfs-amd64    27K   165G    27K  

  On boot, we see

           Starting Mount ZFS filesystems...
  [FAILED] Failed to start Mount ZFS filesystems.
  See 'systemctl status zfs-mount.service' for details.
  Welcome to emergPress Enter for maintenance
  (or press Control-D to continue): 

  # df -h /var/share
  rpool/VARSHARE/lxc                        165G     0  165G   0% /var/share/lxc
  rpool/VARSHARE/lxc/xenial                 165G     0  165G   0% 
  rpool/VARSHARE/lxc/xenial/pkg             165G     0  165G   0% 
  rpool/VARSHARE/lxc/xenial/rootfs-amd64    165G     0  165G   0% 

  Obviously rpool/VARSHARE - the parent of rpool/VARSHARE/lxc - was not 
mounted, even so canmount property is for all set to on, rpool/VARSHARE's 
mountpoint to /var/share and rpool/VARSHARE/lxc children inherit their 

  # systemctl status zfs-mount.service
  ‚óŹ zfs-mount.service - Mount ZFS filesystems
     Loaded: loaded (/lib/systemd/system/zfs-mount.service; static; vendor 
preset: enabled)
     Active: failed (Result: exit-code) since Sun 2017-05-28 04:51:46 CEST; 
13min ago
    Process: 6935 ExecStart=/sbin/zfs mount -a (code=exited, status=1/FAILURE)
   Main PID: 6935 (code=exited, status=1/FAILURE)

  May 28 04:51:45 ares systemd[1]: Starting Mount ZFS filesystems...
  May 28 04:51:45 ares zfs[6935]: cannot mount '/var/share': directory is not 
  May 28 04:51:46 ares systemd[1]: zfs-mount.service: Main process exited, 
code=exited, status=1/FAILURE
  May 28 04:51:46 ares systemd[1]: Failed to start Mount ZFS filesystems.
  May 28 04:51:46 ares systemd[1]: zfs-mount.service: Unit entered failed state.
  May 28 04:51:46 ares systemd[1]: zfs-mount.service: Failed with result 

  So 'zfs mount ...' seems to be severely buggy.

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