The virt-manager displays "Gtk couldn't be initialized"

Question

I am running the virt-manager on RHEL 7.0, but it always display "Gtk couldn't be initialized":

[root@dhb5 ~]# virt-manager --debug --nofork
2015-08-17 03:21:09,895 (cliutils:75): virt-manager startup
2015-08-17 03:21:09,895 (virt-manager:201): Launched as: ['/usr/share/virt-manager/virt-manager', '--debug', '--nofork']
2015-08-17 03:21:09,896 (virt-manager:202): virt-manager version: 0.10.0
2015-08-17 03:21:09,896 (virt-manager:203): virtManager import: <module 'virtManager' from '/usr/share/virt-manager/virtManager/__init__.pyc'>

** (virt-manager:10141): WARNING **: Could not open X display
2015-08-17 03:21:09,957 (virt-manager:246): Traceback (most recent call last):
  File "/usr/share/virt-manager/virt-manager", line 233, in main
    Gtk.Window()
  File "/usr/lib64/python2.7/site-packages/gi/overrides/Gtk.py", line 416, in __init__
    raise RuntimeError("Gtk couldn't be initialized")
RuntimeError: Gtk couldn't be initialized

Gtk couldn't be initialized

And the X11 related configuration in /etc/ssh/sshd_config is like this:

[root@dhb5 ~]# grep -i x11 /etc/ssh/sshd_config
X11Forwarding yes
X11DisplayOffset 10
X11UseLocalhost yes

I try to google many posts, and can't find the answer for my question. Could anyone can give some clues on this issue?

Solution

Use:

ssh -vv -X x.x.x.x

If it appears:

debug1: Remote: No xauth program; cannot forward with spoofing.

then, try with:

yum install xauth

(install it on virtual host).

Comments

[MariusMatutiae]

virt-manager:10141: WARNING : Could not open X display: you do not have an X display on which to open virt-manager.