The first time I installed JACK it asked me whether I wanted to give it realtime permissions. I said yes. I thought that would cause it to create an `audio` group, but I have no such group!
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jeff@jbb-lenovo:~$ groups
jeff adm cdrom sudo dip plugdev lpadmin sambashare
jeff@jbb-lenovo:~$
I installed JACK and qjackctl in the course of trying to install SuperCollider, the [url=ttps://github.com/supercollider/supercollider/blob/master/README_LINUX.md]Linux readme file[/url] for which suggests apt-installing a lot of stuff:
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sudo apt install -y build-essential libsndfile1-dev libasound2-dev libavahi-client-dev libicu-dev libreadline6-dev libfftw3-dev libxt-dev libudev-dev pkg-config
sudo apt install -y libjack-dev ## OR libjack-jackd2-dev
sudo apt install -y qjackctl
sudo apt install -y qt5-default qt5-qmake qttools5-dev qttools5-dev-tools qtdeclarative5-dev libqt5webkit5-dev qtpositioning5-dev libqt5sensors5-dev libqt5opengl5-dev
I use Kubuntu 16.04, on a Lenovo Thinkpad E545.
Thanks for your help!