Solved as per: https://lists.ubuntu.com/archives/ubuntu-mozillateam-
bugs/2012-April/132383.html

* start thunderbird in safe mode (thunderbird -safe-mode )
* don't tick any boxes in the window that comes (don't permanently reset 
anything)
* once thunderbird starts, go to Tools->Addons and disable "Messaging Menu and 
Unity Launcher integration 0.8"
* close thunderbird
* start it in normal mode
-> thunderbird works fine.

So I think the problem actually lies in this extension rather than
unity. I'm not sure if the extension is bundled with thunderbird, unity
or a separate package, but its a confirmed issue in 12.04.

** Changed in: unity
       Status: Invalid => Confirmed

** Changed in: unity (Ubuntu)
       Status: Invalid => Confirmed

** Tags added: oneiric

** Tags removed: oneiric
** Tags added: precise

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https://bugs.launchpad.net/bugs/923565

Title:
  thunderbird no longer starts since upgrage to unity 5

Status in Unity:
  Confirmed
Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  Hi team,

  This is my second bug report on unity 5, related to thunderbird. Upgrading to 
unity 5 broke it so that it can now only be started in safe mode. This happens 
in gnome-shell as well. I've done some searching thinking it was a thunderbird 
problem but i'm now sure it's the upgrade that broke it.
  Running thunderbird from terminal gives:

  
  (thunderbird-bin:13663): GLib-GObject-WARNING **: cannot register existing 
type `DbusmenuMenuitem'

  (thunderbird-bin:13663): GLib-CRITICAL **: g_once_init_leave:
  assertion `initialization_value != 0' failed

  (thunderbird-bin:13663): GLib-GObject-CRITICAL **:
  g_param_spec_object: assertion `g_type_is_a (object_type,
  G_TYPE_OBJECT)' failed

  (thunderbird-bin:13663): GLib-GObject-CRITICAL **:
  g_object_class_install_property: assertion `G_IS_PARAM_SPEC (pspec)'
  failed

  How do I workaround this?

  Thanks

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