Here's my problem : I just have installed QJackCtl on my Ubuntu 12.04 and when I start Jack I got this issue : 12:01:22.769 /usr/local/bin/jackd -dalsa -dhw:0 -r44100 -p1024 -n3 -i1 -o2 Cannot connect to server socket err = Aucun fichier ou dossier de ce type Cannot connect to server socket jack server is not running or cannot be started Unknown driver "alsa" If anyone knows the solution It would help me a lot !