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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lxdm/+bug/1240336/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp