[tor-relays] Failed to load Scramblesuit

[Christian]

Dear fellows,

maybe you can help out.
And maybe I missed some information on my Tor version.
I run an obfuscated bridge (Tor 0.2.5.8-rc (git-eaa9ca1011e73a9d)) on
Ubuntu 12.04 and wanted to enable the scramblesuit pluggable transport.

When changing my line in torrc to

ServerTransportPlugin obfs3,scramblesuit exec /usr/bin/obfsproxy managed

I get the following warning in the logs:

[warn] The communication stream of managed proxy '/usr/bin/obfsproxy' is
'closed'. Most probably the managed proxy stopped running. This might be
a bug of the managed proxy, a bug of Tor, or a misconfiguration. Please
enable logging on your managed proxy and check the logs for errors.
[notice] Failed to terminate process with PID '18171' ('Success').

Obfs3-only works like a charm without complaints.
(ServerTransportPlugin obfs3 exec /usr/bin/obfsproxy managed)

I set my ExtORPort to "auto", pyptlib is installed, packages from
obfsproxy and pyptlib are in the right locations and I use the shipped
apparmor profile for Tor for Ubuntus.

Even if I stop apparmor service, I don't get better results.

I thought it was a permissions problem somehow as
--log-min-severity=debug --log-file=/home/me/obfs.log won't even create
the logfile so that obfsproxy fails from the very beginning.

But, as I said, obfs3-only works without problems.

Any ideas? Thank you in advance.

Kind regards

christian