[SOLVED] Slackware64 14.2. User '1000' does not exist

globetrotterdk · 05-02-2018, 01:09 AM

I am trying to do:

Code:

# groupadd realtime
# usermod -a -G realtime 1000

The first part works, but the second part returns:

Code:

# usermod -a -G realtime 1000
usermod: user '1000' does not exist

.

However, when I run:

Code:

# id -u username                
1000

I am trying to do this as the result of a problem in Ardour 5. A thread recommends the following:

Quote:

Your system is not configured for real time scheduling. You are using JACK2, which refuses to start if realtime scheduling does not work.

Fix your system configuration and it will work again. Alternatively, use the ALSA backend to Ardour. You should fix your system, because Ardour needs RT scheduling no matter which audio/MIDI backend it uses.

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

My issue with Ardour is exactly the same as the thread. Ardour 5 was installed as part of the Studioware audio group.

phenixia2003 · 05-02-2018, 02:01 AM

Hello,

you need to pass the user's name to usermod, not the user's id.

Code:

$ groupadd realtime
$ usermod -a -G realtime 1000
usermod: user '1000' does not exist

$ usermod -a -G realtime seb

$ grep "realtime" /etc/group
realtime:x:1000:seb

--
SeB

globetrotterdk · 05-02-2018, 05:12 AM

Quote:

Originally Posted by phenixia2003

Hello,

you need to pass the user's name to usermod, not the user's id.

--
SeB

Thanks for the reply. Unfortunately, I still have the Ardour 5 "could not create session"

problem.

Alien Bob · 05-02-2018, 10:32 AM

Quote:

Originally Posted by globetrotterdk

Thanks for the reply. Unfortunately, I still have the Ardour 5 "could not create session"

problem.

I think you missed the header "Systems using PAM" when you copied that information about the "realtime" group.
The article does not apply to Slackware.

Studioware does things differently to achieve realtime performance. The most important are:

Append the "threadirqs" option to the kernel commandline (that is, add it to the "append" line in (e)lilo.conf or grub.conf)

Create a file called "/etc/initscript" and make it executable, and give it the following content:

Code:

# Set umask to safe level:
umask 022
# Disable core dumps:
ulimit -c 0
# Allow unlimited size to be locked into memory:
ulimit -l unlimited
# Address issue of jackd failing to start with realtime scheduling:
ulimit -r 65

# Execute the program.
eval exec "$4"