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

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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.
)

** Affects: snapd
     Importance: Undecided
     Assignee: Rafael David Tinoco (inaddy)
         Status: Invalid

** Affects: systemd (Ubuntu)
     Importance: Medium
     Assignee: Rafael David Tinoco (inaddy)
         Status: In Progress

** Affects: systemd (Ubuntu Trusty)
     Importance: Undecided
     Assignee: Rafael David Tinoco (inaddy)
         Status: In Progress


** Tags: patch sts sts-sponsor
-- 
Cannot install snaps on Ubuntu 14.04 with /var on its own partition
https://bugs.launchpad.net/bugs/1718966
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