don't run arm as the tor user, Roger tells you why:
https://lists.torproject.org/pipermail/tor-relays/2016-May/009259.html
as the user that will be running arm, run "sudo adduser $USER debian-tor" to add your user to the debian-tor group so it can reach Tor's controlsocket. Then log out and log back in (so your user is actually in the group), and run "arm".
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