The bug linked by unrud (#5) seems to describe the cause (at least in my case). I was able to make Gajim start without freezing the system by removing read access to the /proc file:
sudo chmod o-r /proc/brcm_monitor0 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1452006 Title: Gajim freezes whole system on start To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gajim/+bug/1452006/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
