Comment # 3 on bug 907958 from Martin Pluskal

btw on SLE-12 following occurs:
# virt-manager --debug
[Tue, 09 Dec 2014 10:28:18 virt-manager 2669] DEBUG (cli:187) Launched with
command line: /usr/share/virt-manager/virt-manager --debug
[Tue, 09 Dec 2014 10:28:18 virt-manager 2669] DEBUG (virt-manager:150)
virt-manager version: 1.0.1
[Tue, 09 Dec 2014 10:28:18 virt-manager 2669] DEBUG (virt-manager:151)
virtManager import: <module 'virtManager' from
'/usr/share/virt-manager/virtManager/__init__.pyc'>
Unable to init server: Could not connect: Connection refused
[Tue, 09 Dec 2014 10:28:18 virt-manager 2669] DEBUG (virt-manager:193)
Traceback (most recent call last):
  File "/usr/share/virt-manager/virt-manager", line 181, in main
    Gtk.Window()
  File "/usr/lib64/python2.7/site-packages/gi/overrides/Gtk.py", line 437, in
__init__
    raise RuntimeError("Gtk couldn't be initialized")
RuntimeError: Gtk couldn't be initialized

Gtk couldn't be initialized

So it looks like regression.