Error in error message - "(null)" instead user name

[Vladimir Rutsky]

I'm trying to use ardour2 and in one of configuration it runs command that I can later repeat in console I obtain following output:

$ /usr/bin/jackd -m -p 128 -T -d alsa -n 2 -r 48000 -p 1024 -d hw:0,0
jackd 0.118.0
Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn and others.
jackd 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 is running in realtime mode, but you are not allowed to use realtime scheduling.

Your system has an audio group, but you are not a member of it.
Please add yourself to the audio group by executing (as root):
  usermod -a -G audio (null)

After applying these changes, please re-login in order for them to take effect.

You don't appear to have a sane system configuration. It is very likely that you
encounter xruns. Please apply all the above mentioned changes and start jack again!

Note this string:
  usermod -a -G audio (null)
The bug is: instead of "(null)" there definitely should be my user name.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: jackd 0.118+svn3796-1ubuntu2
ProcVersionSignature: Ubuntu 2.6.32-26.48-generic 2.6.32.24+drm33.11
Uname: Linux 2.6.32-26-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Sat Dec 11 21:57:14 2010
SourcePackage: jack-audio-connection-kit