Comment 9 for bug 882862

precise got a new version now, should be fixed there:

lightdm (1.1.1-0ubuntu1) precise; urgency=low

  * New upstream release:
    * Support PAM requesting a change of password (lp: #911597)
    * Support for reading users' backgrounds from Accounts Service
      (lp: #844081)
    * Switching to a user without a password bypasses the greeter
      (lp: #861177)
    * Move the GTK+ and Qt greeters into their own projects
  * Drop the gtk and qt greeters packaging files from this source
  * debian/liblightdm-gobject-1-0.symbols:
    - list new lightdm_user_get_background symbol
  * debian/patches/04_CVE-2011-4105.patch,
    debian/patches/05_CVE-2011-3153.patch,
    debian/patches/09_show_lang_chooser_option.patch,
    debian/patches/10_available_languages.patch,
    debian/patches/11_set_language_in_accountsservice.patch:
    - dropped, those issues are fixed in the new version or apply to the
      gtk greeter which is moved to its own source
  * debian/rules:
    - install lightdm-set-defaults back to its previous location