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[Martin Spacek <launchpad@xxxxxxxxxxxxx>]

I'm seeing the same thing in Xubuntu 14.04: pkexec works in text mode,
but not GUI mode. If I run it with the --disable-internal-agent flag, it
raises "Error executing command as another user: No authentication agent
found." polkitd is running, as is polkit-gnome-authentication-agent-1.

This is a fresh install. This wasn't a problem in Xubuntu 12.10. I have
installed some gnome-related packages in order to compile various
programs. "Policykit Authentication Agent" in Session & Startup in the
settings is enabled.

-- 
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Touch seeded packages, which is subscribed to policykit-1 in Ubuntu.
https://bugs.launchpad.net/bugs/976638

Title:
  pkexec does not find any authentication agent

Status in “policykit-1” package in Ubuntu:
  Confirmed

Bug description:
  I am using xubuntu, but I am pretty sure that other variants are
  affected too.

  My problem started with being unable to start synaptic from the menu.
  So far, I have found out that synaptic is started with pkexec.

  When I test starting
  pkexec /usr/sbin/synaptic
  in a terminal, it asks for the password in text mode.

  With another test
  pkexec --disable-internal-agent /usr/sbin/synaptic
  in the terminal, it says it has not found any authentication agent.

  I have two AMD64 PC's and a i386 laptop. The problem occurs on one of the PC's and the laptop.
  Comparing the /etc directory trees of the PC's showed many differences, but I could not find anything suspicious about the polycikit configuration.

  For the moment, using gksu instead of pkexec is a workaround.

  Thanks and Regards,
  Markus

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: policykit-1 0.104-1
  ProcVersionSignature: Ubuntu 3.2.0-22.35-generic 3.2.14
  Uname: Linux 3.2.0-22-generic x86_64
  ApportVersion: 2.0-0ubuntu4
  Architecture: amd64
  Date: Sun Apr  8 17:05:34 2012
  InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120330)
  ProcEnviron:
   LANGUAGE=de_DE:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: policykit-1
  UpgradeStatus: No upgrade log present (probably fresh install)

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