my story:
I use gdm + gnome and upgraded via upgrade manager from 12.10 => 13.04 and also 
from 13.04 => 13.10.
It worked  for some weeks until a week ago. (GDM screen started but no 
loginwindow)
Switching to terminal (CTRL+ALT+F1) worked. 

After a long search I found out that switching from gdm to lightdm brought me 
back into GUI Mode (sudo dpkg-reconfigure gdm => change to lightdm and reboot)
But then I found out I have permission problems like you described 
(Softwarecenter install/uninstall, updates, network, USB)

I tried a lot so I can't be sure what the solution was, but the last things I 
tried were:
#19 
* (sudo pam-auth-update --force
* reboot
=> did not work

#23
* add 
    session required pam_loginuid.so
    session required pam_systemd.so
  to /etc/pam.d/gdm
* dpkg-reconfigure gdm (and select gdm)
* reboot
=> did not work (still no login window)

#23
* add 
    session required pam_loginuid.so
    session required pam_systemd.so
  to /etc/pam.d/lightdm
* dpkg-reconfigure gdm (and select lightdm)
* reboot
=> works! I can change network settings, install/uninstall packages, connect 
usb devices

#23
* try again "dpkg-reconfigure gdm" (and select gdm)
* (new lines in /etc/pam.d/gdm are already there from previous try)
* reboot
=> works!

I don't know why/how but now also gdm is working again

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to policykit-desktop-privileges in Ubuntu.
https://bugs.launchpad.net/bugs/1240336

Title:
  Not authorized to perform operation....

Status in “lxdm” package in Ubuntu:
  Confirmed
Status in “policykit-desktop-privileges” package in Ubuntu:
  Confirmed

Bug description:
  After a new install of 64 bit Ubuntu 13.10 on my second partition, I
  used dpkg to reinstall all the same packages I had on my 32 bit 13.04
  partition.  I copied all my home directory files over and updated all
  the packages.  I now find that I don't have permissions to change the
  network settings; I can't mount my other hard drive or any USB stick
  using nautilus, or (udisks without using sudo)' I can't run synaptic
  by clicking on the GUI (I have to go to a terminal and sudo synaptic);
  etc.  I can't find any documentation on the configuration of
  policykit-desktop-privileges, so I'm filing this bug.  For me it
  appears to be totally broken.  Maybe someone can help me out.

  Thanks,

  Rob

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: policykit-desktop-privileges 0.16
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2
  Architecture: amd64
  Date: Tue Oct 15 20:20:55 2013
  InstallationDate: Installed on 2013-10-09 (7 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Beta amd64 (20131008)
  MarkForUpload: True
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: policykit-desktop-privileges
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/ubuntu/+source/lxdm/+bug/1240336/+subscriptions

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