Since this is similar to a closed bug, Might this be fixed for you?
** Changed in: policykit-1 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1010919
Title:
Authenication window occasionally fails to open, then affects all
policykit instances
Status in “policykit-1” package in Ubuntu:
Incomplete
Bug description:
Unfortunately this seems to happen 'out of the blue', then only a log
out in returns to working (other than authenticating thru a terminal
like in pkexec synaptic which will work
Ex. errors -
synaptic -
Error creating textual authentication agent: Error opening current
controlling terminal for the process (`/dev/tty'): No such device or address
Software-center when trying to install a package -
softwarecenter.backend - WARNING - _on_trans_error:
org.freedesktop.PolicyKit.Error.Failed: ('system-bus-name', {'name':
':1.370'}): org.debian.apt.install-or-remove-packages
software sources when trying to change server -
dbus.exceptions.DBusException:
com.ubuntu.SoftwareProperties.PermissionDeniedByPolicy:
com.ubuntu.softwareproperties.applychanges
user-accounts when trying to unlock -
(gnome-control-center:8358): Gtk-WARNING **: Error acquiring permission:
Failed to acquire permission for action-id
org.freedesktop.accounts.user-administration
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: dbus 1.4.18-1ubuntu1
ProcVersionSignature: Ubuntu 3.4.0-5.11-generic 3.4.0
Uname: Linux 3.4.0-5-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.1.1-0ubuntu2
Architecture: amd64
Date: Sat Jun 9 11:14:00 2012
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120603)
ProcEnviron:
TERM=xterm
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: dbus
UpgradeStatus: No upgrade log present (probably fresh install)
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