[Bug 1577001] [NEW] Installing lxd leaves /var/lib/lxd/unix.socket with wrong group ownership

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On ubuntu 16.04, doing
  sudo apt-get install lxd
sometimes leaves the file
  /var/lib/lxd/unix.socket
with group root, but it should have group lxd.   Doing
  sudo systemctl restart lxd.socket
rescues the file and gives it the right group ownership.

Adding logging to the package's postinst shows that, if /var/lib/lxd/unix.socket did not already exist, it is created by the line
 deb-systemd-helper enable lxd.service
and with the wrong group permissions.
If the socket already existed with the correct group ownership that command breaks the permissions and sets it to be group root.

It's about 90% repeatable on one machine here (with an SSD main disk).

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lxd 2.0.0-0ubuntu4
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Apr 30 08:24:53 2016
InstallationDate: Installed on 2016-03-26 (35 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160323)
SourcePackage: lxd
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug xenial
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Installing lxd leaves /var/lib/lxd/unix.socket with wrong group ownership
https://bugs.launchpad.net/bugs/1577001
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