I just installed Ubuntu trusty (on crouton on an Acer Chromebook), and am trying to get sound going (so I can run Super-Collider.)

Upon the advice of various webpages I've come across that discuss installation of Super-Collider, I've tried:

removing pulseaudio
adding myself to the "hwaudio" group
adding '@audio' entries to /etc/security/limits.conf

But I always get "Could not connect to JACK server as client" when I run qjackctl.

This is the output I get when I run qjackctl. I've tried changing the interface to both 'cras' and 'hw:DAISY12S', but neither work.

23:54:23.518 Patchbay deactivated.

23:54:23.585 Statistics reset.

23:54:23.598 ALSA connection change.

23:54:23.643 D-BUS: Service not available (org.jackaudio.service aka jackdbus).

23:54:23.667 JACK is starting...

23:54:23.668 /usr/bin/jackd -dalsa -dcras -r44100 -p1024 -n2

23:54:23.686 ALSA connection graph change.

jackd 0.122.0

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 compiled with System V SHM support.

loading driver ..

apparent rate = 44100

creating alsa driver ... cras|cras|1024|2|44100|0|0|nomon|swmeter|-|32bit

Couldn't connect to cras.

control open "cras" (Operation not permitted)

configuring for 44100Hz, period = 1024 frames (23.2 ms), buffer = 2 periods

ALSA: final selected sample format for capture: 32bit integer little-endian

ALSA: use 2 periods for capture

ALSA: cannot set hardware parameters for capture

ALSA: cannot configure capture channel

cannot load driver module alsa

(qjackctl:13298): Gtk-CRITICAL **: IA__gtk_widget_get_direction: assertion 'GTK_IS_WIDGET (widget)' failed

23:54:23.980 JACK was started with PID=13310.

23:54:24.042 JACK was stopped successfully.

My apologies if I'm asking this in the wrong place, or if I'm not giving enough info. I'll ask elsewhere if that's more appropriate. But any advice or suggestions would be much appreciated!