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Installing apparmor-utils should help.
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After putting tor in complain mode for a while, run aa-logprof
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It will ask whether you want to permit violations of the existing profile and update it accordingly.
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Here is a brief tutorial
http://www.insanitybit.com/2012/05/29/apparmor-how-to/
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Cheers
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Message: 3
Date: Thu, 31 Dec 2015 12:58:46 -0800
From: James Moore <hello@jmoore.me>
To: tor-relays@lists.torproject.org
Subject: [tor-relays] Problem starting tor after upgrading to ubuntu
šššššššš15.10 / tor 0.2.7.6
Message-ID: <B2F39C83-0B75-46BB-9803-3057A5CC88E0@jmoore.me>
Content-Type: text/plain; charset=us-ascii

Hello all, I've been running two exits for quote some time now and today I decided to update my OS and tor version but it didn't go too well. I was updating from ubuntu 15.04 / 0.2.6.10 to 15.10 / 0.2.7.6. I'm using the apt feed from

deb http://deb.torproject.org/torproject.org wily main

It appears that something about the AppArmor configuration is incorrect but I don't know enough about systemd/apparmor to properly diagnose it. Here are some log snippets:

http://pastebin.com/8jzEiz3T

It seems to come down to this

tor@default.service: Failed at step EXEC spawning /usr/bin/tor: Operation not permitted

I discovered that commenting out the Hardening section of /lib/systemd/system/tor@default.service get's it working again but I'd prefer not to run out-of-band configuration files. Can anyone shed light on this problem? I'm happy to provide more info.

James

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