This bug was fixed in the package zfs-linux - 0.7.5-1ubuntu3

zfs-linux (0.7.5-1ubuntu3) bionic; urgency=medium

  * Add new module loading systemd service (LP: #1741081)
    - loads zfs module unconditionally, and make the
      zfs-import-cache.service and zfs-import-scan.service services
      require this service.

 -- Colin Ian King <>  Fri, 2 Mar 2018 11:47:12

** Changed in: zfs-linux (Ubuntu Bionic)
       Status: In Progress => Fix Released

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  zfs-import-cache.service fails on startup

Status in zfs-linux package in Ubuntu:
  Fix Released
Status in zfs-linux source package in Artful:
  In Progress
Status in zfs-linux source package in Bionic:
  Fix Released

Bug description:
  I just noticed on my test VM of artful that zfs-import-cache.service
  does not have a ConditionPathExists=/etc/zfs/zpool.cache. Because of
  that, it fails on startup, since the cache file does not exist.

  This line is being deleted by 
debian/patches/ubuntu-load-zfs-unconditionally.patch. This patch seems to exist 

  This patch still exists in bionic, so I assume it will be similarly

  If the goal of the patch is to load the module (and only that), I
  think it should create a third unit instead:

   ^^ runs modprobe zfs

  zfs-import-cache.service & zfs-import-scan.service
    ^^ per upstream minus modprobe plus Requires=zfs-load-module.service

  I have tested this manually and it works. I can submit a package patch
  if this is the desired solution.

  Interestingly, before this change, zfs-import-scan.service wasn't
  starting. If started manually, it worked. I had to give it a
  `systemctl enable zfs-import-scan.service` to create the Wants
  symlinks. Looking at the zfsutils-linux.postinst, I see the correct
  boilerplate from dh_systemd, so I'm not sure why this wasn't already
  done. Can anyone confirm or deny whether zfs-import-scan.service is
  enabled out-of-the-box on their system?

  Is the zfs-import-scan.service not starting actually the cause of the
  original bug? The design is that *either* zfs-import-cache.service or
  zfs-import-scan.service starts. They both call modprobe zfs.

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