[Bug 1718966] Re: Cannot install snaps on Ubuntu 14.04 with /var on its own partition

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Title:
  Cannot install snaps on Ubuntu 14.04 with /var on its own partition

Status in snapd:
  Invalid
Status in systemd package in Ubuntu:
  In Progress
Status in systemd source package in Trusty:
  In Progress

Bug description:
  Installing snaps is not possible on Ubuntu 14.04 when having /var on
  its own partition, whether its LVM or not.

  The issue is with the core snap being unable to mount:

  The error with /var isolated and using LVM:

  root at ubuntu:~# snap install canonical-livepatch
  error: cannot perform the following tasks:
  - Mount snap "core" (2898) ([start snap-core-2898.mount] failed with exit status 6: Failed to issue method call: Unit systemd-fsck at dev-mapper-vg00\x2dvarvol.service failed to load: No such file or directory. See system logs and 'systemctl status systemd-fsck at dev-mapper-vg00\x2dvarvol.service' for details.
  )

  The error with /var isolated but without using LVM:

  root at ubuntu:~# snap install canonical-livepatch
  error: cannot perform the following tasks:
  - Mount snap "core" (2898) ([start snap-core-2898.mount] failed with exit status 6: Failed to issue method call: Unit systemd-fsck at dev-disk-by\x2duuid-7383abd2\x2d019c\x2d46c2\x2d8b36\x2d34633cc8f3ca.service failed to load: No such file or directory. See system logs and 'systemctl status systemd-fsck at dev-disk-by\x2duuid-7383abd2\x2d019c\x2d46c2\x2d8b36\x2d34633cc8f3ca.service' for details.
  )

  The same error happens if I try to install the hello-world snap (with
  LVM in this example):

  root at ubuntu:~# snap install hello-world
  error: cannot perform the following tasks:
  - Mount snap "core" (2898) ([start snap-core-2898.mount] failed with exit status 6: Failed to issue method call: Unit systemd-fsck at dev-mapper-vg00\x2dvarvol.service failed to load: No such file or directory. See system logs and 'systemctl status systemd-fsck at dev-mapper-vg00\x2dvarvol.service' for details.
  )

  I cannot reproduce the issue in Ubuntu 16.04.

  I couldn't reproduce this issue by using the Ubuntu 14.04 cloud image
  which doesn't isolate /var on its own partition. I tried adding a
  secondary disk to that cloud image VM and create a dummy VG and LV,
  but couldn't reproduce the issue.

  Also could not reproduce using Ubuntu 14.04 (with LVM or not) but with
  only a / partition and swap.

  
  Steps to reproduce:
  ===================

  # Install Ubuntu 14.04 in KVM (I used the 14.04.4 server iso) and
  configure /, /var and swap on their own partitions (with LVM or not,
  the issue happens in both situations).

  root at ubuntu:~# lvs
  LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert
  rootvol vg00 -wi-ao--- 3.72g 
  swap vg00 -wi-ao--- 3.72g 
  varvol vg00 -wi-ao--- 3.72g 

  root at ubuntu:~# df -h
  Filesystem               Size  Used Avail Use% Mounted on
  udev                     484M  4.0K  484M   1% /dev
  tmpfs                    100M  988K   99M   1% /run
  /dev/dm-0                3.7G  1.7G  1.8G  49% /
  none                     4.0K     0  4.0K   0% /sys/fs/cgroup
  none                     5.0M     0  5.0M   0% /run/lock
  none                     497M     0  497M   0% /run/shm
  none                     100M     0  100M   0% /run/user
  /dev/mapper/vg00-varvol  3.7G  716M  2.8G  21% /var

  
  # Upgrade system, install snapd and reboot

  root at ubuntu:~# apt update
  root at ubuntu:~# apt upgrade -y
  root at ubuntu:~# apt install -y snapd
  root at ubuntu:~# reboot

  
  # After reboot, check kernel version and try to install the canonical-livepatch snap:

  root at ubuntu:~# uname -a
  Linux ubuntu 4.4.0-96-generic #119~14.04.1-Ubuntu SMP Wed Sep 13 08:40:48 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

  root at ubuntu:~# snap list
  No snaps are installed yet. Try "snap install hello-world".

  root at ubuntu:~# snap install canonical-livepatch
  error: cannot perform the following tasks:
  - Mount snap "core" (2898) ([start snap-core-2898.mount] failed with exit status 6: Failed to issue method call: Unit systemd-fsck at dev-mapper-vg00\x2dvarvol.service failed to load: No such file or directory. See system logs and 'systemctl status systemd-fsck at dev-mapper-vg00\x2dvarvol.service' for details.
  )

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