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Software can't be installed or removed because the authentication service is not available. (org.freedesktop.PolicyKit.Error.Failed: ('system-bus-name', {'name': ':1.168'}): org.debian.apt.install-or-remove-packages

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I think it would help pointing to the fixes that didn't help. – Jorge Suárez de Lis Jan 22 '13 at 21:28

Please make sure you have aptdaemon installed properly by running on a terminal:

sudo apt-get install --reinstall aptdaemon aptdaemon-data

After this, please try again. This is just a guessing, though.

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Please check that your proxy settings are what they should be. I had this issue because my proxy config was wrong.

See my answer to a similar question.

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