Ubuntu
libxcb package

  1. Bug #232364
  2. Comment #17

Comment 17 for bug 232364

Revision history for this message
Remove Me (remove-me) wrote : Re: dbus-launch freezes for unknown reason at session start

http://ubuntuforums.org/showthread.php?s=e0e7563685c47e976781c3f846c1a6b5&p=4918094#post4918094

seems to be the same issue. The workaround (to disable ssh-agent lines in /etc/xdg/xfce4/xinitrc) works for me too.