[Bug 1573173] Re: do-release-upgrade fails to setup the sandbox

[James]

NOTE! All of my volumes (except boot) are ZFS

Stopped the LXD and Docker daemons which may have collided with the
upgrade sandbox aufs. It may function if any daemons also using aufs are
stopped.

However, this did not work for me. After disabling all non-essential
services and re-running the do-release-upgrade -d -s, I now get a
different error condition.

------------------------------------------
Checking package manager
mount: wrong fs type, bad option, bad superblock on none,
       missing codepage or helper program, or other error
       (for several filesystems (e.g. nfs, cifs) you might
       need a /sbin/mount.<type> helper program)
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

Sandbox setup failed 
------------------------------------------

So, I presume that the do-release-upgrade is not ZFS aware.

NOTE! All of my volumes (except boot) are ZFS

14.04.4 LTS, amd64

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https://bugs.launchpad.net/bugs/1573173

Title:
  do-release-upgrade fails to setup the sandbox

Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed

Bug description:
  When launching 'do-release-upgrade -s', it fails to set up the sandbox
  environment

  $ cat /etc/lsb-release 
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=14.04
  DISTRIB_CODENAME=trusty
  DISTRIB_DESCRIPTION="Ubuntu 14.04.4 LTS"

  $ apt-cache policy ubuntu-release-upgrader-core
  ubuntu-release-upgrader-core:
    Installed: 1:0.220.8
    Candidate: 1:0.220.8
    Version table:
   *** 1:0.220.8 0
          500 http://ca.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       1:0.220.2 0
          500 http://ca.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 4.2.0-35.40~14.04.1-generic 4.2.8-ckt5
  Uname: Linux 4.2.0-35-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CrashDB: ubuntu
  Date: Thu Apr 21 14:03:02 2016
  InstallationDate: Installed on 2015-01-08 (469 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_CA:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-04-21 (0 days ago)
  VarLogDistupgradeTermlog:

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