software-center not work in fluxbox (without policykit-agent running?)

Ubuntu Software Center is not Unity-specific. I use it in XFCE and it works just fine.

So, please be more specific about "nothing works". Does the window open? Can you navigate to an application screen? Can you click the "Install" button? Please provide steps to reproduce the problem, what happens, and what you expected to happen. Thanks.

Localfile (nautilus+fluxbox or firefox+apt-url) can not be install because they do not ask for a password as root (gdebi: OK)
Install/Remove button is clickable, but it does nothing, even no error reports.

Gtk-WARNING **: Unknown property: GtkGrid.n-columns
2012-03-12 13:42:54,877 - softwarecenter.backend - WARNING - _on_trans_error: org.freedesktop.PolicyKit.Error.Failed: ('system-bus-name', {'name': ':1.144'}): org.debian.apt.install-or-remove-packages

If you use in terminal 'gksu software-center' work, but from the Nautilus and the browser is not caused by the terminal and the USC.
In any case, does not work "Write your own review" - when pressed, nothing happens.
There is no way to update the package list (need 'sudo apt-get update' or synaptic)

Thanks for your bugreport.

Could you please check if you have a process called "/usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1" ?
E.g. via
$ ps afx|grep policykit

It looks like there is no authentication agent in your session running.

~$ ps afx|grep policykit
25339 pts/1 S+ 0:00 \_ grep policykit
 1354 ? Sl 0:00 /usr/lib/policykit-1/polkitd --no-debug

~$ /usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1

(polkit-gnome-authentication-agent-1:25519): GLib-CRITICAL **: g_variant_new_string: assertion `string != NULL' failed

(polkit-gnome-authentication-agent-1:25519): polkit-gnome-1-WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

I have a similar problem in Xubuntu 12.04: synaptic, gparted etc ... are no mor startable from the menu. Starting /usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1 gives the same error message as above.

I have 2 AMD64 PC's and an i386 Laptop. The problem occurs on one of the PC's and the Laptop.
Before I found this bug report, I already had opened my own one:
It's Bug #976638.

after /usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1
....#5

~$ pkexec software-center
** (software-center:19467): WARNING **: Command line `dbus-launch --autolaunch=88bf69b62e8e1077f3c30fbd4c24e436 --binary-syntax --close-stderr' exited with non-zero exit status 1: Autolaunch error: X11 initialization failed.\n
Traceback (most recent call last):
  File "/usr/bin/software-center", line 25, in <module>
    from gi.repository import Gtk, GObject
  File "/usr/lib/python2.7/dist-packages/gi/importer.py", line 76, in load_module
    dynamic_module._load()
  File "/usr/lib/python2.7/dist-packages/gi/module.py", line 224, in _load
    overrides_modules = __import__('gi.overrides', fromlist=[self._namespace])
  File "/usr/lib/python2.7/dist-packages/gi/overrides/Gtk.py", line 1517, in <module>
    raise RuntimeError("Gtk couldn't be initialized")
RuntimeError: Gtk couldn't be initialized

Full FAIL!

As I am affected by the "root cause" in a similar way, can I help fixing the "incomplete" status ?