qjackctl cannot start jack: ERROR: cannot register object path

[mokabar]

after upgrading from 12.10 to 13.04, qjackctl cannot start jack. it complains with:

`
sh: artsshell: command not found
10:54:29.410 Startup script terminated with exit status=32512.
10:54:29.476 D-BUS: JACK server could not be started. Sorry
Sun Mar 10 10:54:29 2013: Starting jack server...
Sun Mar 10 10:54:29 2013: JACK server starting in realtime mode with priority 89
Sun Mar 10 10:54:29 2013: ERROR: cannot register object path "/org/freedesktop/ReserveDevice1/Audio5": A handler is already registered for /org/freedesktop/ReserveDevice1/Audio5
Sun Mar 10 10:54:29 2013: ERROR: Failed to acquire device name : Audio5 error : A handler is already registered for /org/freedesktop/ReserveDevice1/Audio5
Sun Mar 10 10:54:29 2013: ERROR: Audio device hw:5 cannot be acquired...
Sun Mar 10 10:54:29 2013: ERROR: Cannot initialize driver
Sun Mar 10 10:54:29 2013: ERROR: JackServer::Open failed with -1
Sun Mar 10 10:54:29 2013: ERROR: Failed to open server
Sun Mar 10 10:54:30 2013: Saving settings to "/home/tim/.config/jack/conf.xml" ...
10:54:31.487 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info.
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
`

starting jack from terminal works, though:
`
tim@moka:~$ /usr/bin/jackd -r -p512 -t2000 -dalsa -dhw:5 -r96000 -p2048 -n2 -Xseq -P -o
jackdmp 1.9.10
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2013 Grame.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK server starting in non-realtime mode
audio_reservation_init
Acquire audio card Audio5
creating alsa driver ... hw:5|-|2048|2|96000|0|0|nomon|swmeter|-|32bit
configuring for 96000Hz, period = 2048 frames (21.3 ms), buffer = 2 periods
ALSA: final selected sample format for playback: 32bit integer little-endian
ALSA: use 2 periods for playback
port created: Midi-Through:midi/playback_1
port created: Midi-Through:midi/capture_1
port created: Hammerfall-DSP:midi/playback_1
port created: Hammerfall-DSP:midi/capture_1
`

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[James Stewart Miller (jamesstewartmiller)]

could this be occurring because python-dbus is set to python3-dbus and the installed version of python is 2.7.3?

[Mirko Guarnier (guarnier-mirko)]

Same here on ubuntu studio 12.04. Any update?