Public bug reported:

I'm running Ubuntu 17.04.  I've installed jack2 and have added myself to
the 'audio' group as suggested at

  http://jackaudio.org/faq/linux_rt_config.html

But when I start JACK it reports

Tue May 23 16:10:24 2017: ERROR: Cannot use real-time scheduling (RR/10)(1: 
Operation not permitted)
Tue May 23 16:10:24 2017: ERROR: AcquireSelfRealTime error

I am in the 'audio' group in /etc/group:

adam:~$ grep audio /etc/group
audio:x:29:pulse,adam
adam:~$

(I restarted the machine after adding myself to this group.)

'ulimit' isn't showing real-time priority privileges for me:

adam:~$ ulimit -a | grep real
real-time priority              (-r) 0
adam:~$ 

The file /etc/security/limits.d looks like this:

===

# Provided by the jackd package.
#
# Changes to this file will be preserved.
#
# If you want to enable/disable realtime permissions, run
#
#    dpkg-reconfigure -p high jackd

@audio   -  rtprio     95
@audio   -  memlock    unlimited
#@audio   -  nice      -19

===

** Affects: jackd2 (Ubuntu)
     Importance: Undecided
         Status: New

** Summary changed:

- can't start JACK with real-time schedule even when in audio group
+ can't start JACK with real-time scheduling even when in audio group

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https://bugs.launchpad.net/bugs/1693024

Title:
  can't start JACK with real-time scheduling even when in audio group

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