Ok yes seems you are right. I didn't realise this feature made it into
12.04 final release. In that case its a possible issue with Gnome
Control Panel rather than Unity Greeter. As the control panel is what
would need to make the copy of the image.

** Changed in: hundredpapercuts
       Status: Invalid => Triaged

** Also affects: gnome-control-center (Ubuntu)
   Importance: Undecided
       Status: New

** Summary changed:

- Default wallpaper at login screen
+ control center should make copy of background image to avoid permission 
issues with unity greeter

** Changed in: gnome-control-center (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/993480

Title:
  control center should make copy of background image to avoid
  permission issues with unity greeter

Status in One Hundred Paper Cuts:
  Triaged
Status in “gnome-control-center” package in Ubuntu:
  Confirmed
Status in “unity-greeter” package in Ubuntu:
  Invalid

Bug description:
  This happens on both my laptop (Ubuntu 12.04 LTS, AMD64, Unity 2D, 
nvidia-current) and my desktop (Ubuntu 12.04 LTS, AMD64, Unity, nvidia-current).
  I think it just used to work in Beta 2.
  --

  On both computers, my wallpaper is set to `/home/robin/Ubuntu
  One/Wallpapers/Mockingjay.jpg`, and I already tried `chmod 777`. All I
  get at the login screen is the default wallpaper, in stead of the
  user-specified wallpaper.

  File: `/home/robin/Ubuntu One/Wallpapers/Mockingjay.jpg`
  -rw-rw-r--  1 robin robin 1031328 Apr 26 20:05 Mockingjay.jpg

  robin@RobinJ:/var/log/lightdm$ sudo cat x-0-greeter.log | grep jpg
  [+1.30s] DEBUG: background.vala:67: Making background /home/robin/Ubuntu 
One/Wallpapers/Mockingjay.jpg at 1280x800
  [+1.30s] DEBUG: background.vala:144: Error loading background: Failed to open 
file '/home/robin/Ubuntu One/Wallpapers/Mockingjay.jpg': Permission denied
  [+1.40s] DEBUG: background.vala:116: Render of background /home/robin/Ubuntu 
One/Wallpapers/Mockingjay.jpg complete

  Shouldn't `-rw-rw-r--` mean that everyone has reading permissions to
  that file?

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