LightDM doesn't take full ownership of /var/lib/lightdm which can prevent lightdm from starting

Bug #1055783 reported by Jeremy Bicha on 2012-09-24
This bug affects 3 people
Affects Status Importance Assigned to Milestone
lightdm (Ubuntu)
Matt Fischer

Bug Description

1. Install lightdm
2. Remove lightdm
3. Install some random package that adds a new system user
4. Install unity-greeter which pulls in lightdm
5. Set lightdm as default and either reboot or kill any other dm's and sudo service lightdm start

What should happen
You get the pretty Unity greeter

What does happen
You get the X failed to start box.

During the install in step 4, I got this output:

Setting up lightdm (1.3.3-0ubuntu4) ...
Adding group `lightdm' (GID 131) ...
Warning: The home dir /var/lib/lightdm you specified already exists.
Adding system user `lightdm' (UID 119) ...
Adding new user `lightdm' (UID 119) with group `lightdm' ...
The home directory `/var/lib/lightdm' already exists. Not copying from `/etc/skel'.
adduser: Warning: The home directory `/var/lib/lightdm' does not belong to the user you are currently creating.
usermod: no changes
usermod: no changes
usermod: no changes

I verified that /var/lib/lightdm was owned by lightdm:lightdm. However, there are a bunch of left-over dot files and directories inside /var/lib/lightdm that are owned by some other random system user.

Proposed fix
This in debian/lightdm.postinst should be recursive:

if [ -d /var/lib/lightdm ]; then
  chown lightdm:lightdm /var/lib/lightdm
  chmod 0750 /var/lib/lightdm

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: lightdm 1.3.3-0ubuntu4
ProcVersionSignature: Ubuntu 3.5.0-15.22-generic 3.5.4
Uname: Linux 3.5.0-15-generic x86_64
ApportVersion: 2.5.2-0ubuntu4
Architecture: amd64
Date: Mon Sep 24 16:58:04 2012
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

Related branches

Jeremy Bicha (jbicha) wrote :
Changed in lightdm (Ubuntu):
status: New → Triaged
importance: Undecided → High
Matt Fischer (mfisch) on 2012-10-15
Changed in lightdm (Ubuntu):
status: Triaged → In Progress
assignee: nobody → Matt Fischer (mfisch)
Matt Fischer (mfisch) on 2012-11-08
Changed in lightdm (Ubuntu):
status: In Progress → Fix Committed
Robert Ancell (robert-ancell) wrote :

Was fixed in 1.4.0-0ubuntu3

Changed in lightdm (Ubuntu):
status: Fix Committed → Fix Released
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