Public bug reported:

Fresh uvt-kvm guest, then
$ sudo apt-get install zfsutils-linux
$ sudo reboot

The reboot will show on console waiting for tasks, then after ~ 60 seconds it 
continues boot.
Logging in shows:

$ sudo systemd-analyze critical-chain zfs-mount.service
The time after the unit is active or started is printed after the "@" character.
The time the unit takes to start is printed after the "+" character.

zfs-mount.service +81ms
└─zfs-import-cache.service @1min 786ms +272ms
  └─systemd-udev-settle.service @494ms +1min 275ms
    └─systemd-udev-trigger.service @415ms +55ms
      └─systemd-udevd-control.socket @260ms
        └─-.mount @124ms
          └─system.slice @129ms
            └─-.slice @124ms

Seems possibly related / or some discussion at
https://github.com/zfsonlinux/zfs/issues/2368

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: zfsutils-linux 0.6.5.6-0ubuntu8
ProcVersionSignature: User Name 4.4.0-18.34-generic 4.4.6
Uname: Linux 4.4.0-18-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.20.1-0ubuntu1
Architecture: amd64
Date: Mon Apr 18 16:42:35 2016
ProcEnviron:
 TERM=screen.xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: zfs-linux
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.sudoers.d.zfs: [deleted]

** Affects: zfs-linux (Ubuntu)
     Importance: High
         Status: Confirmed


** Tags: amd64 apport-bug uec-images xenial

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https://bugs.launchpad.net/bugs/1571761

Title:
  zfs-import-cache.service slows boot by 60 seconds

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