I have also experienced this when surfing with firefox. I guess the relevant lines in my messages log are:
Aug 6 08:47:08 gandalf pulseaudio[18588]: pid.c: Stale PID file, overwriting. Aug 6 08:47:12 gandalf pulseaudio[18588]: main.c: Unable to contact D-Bus: org.freedesktop.DBus.Error.NoServer: Failed to connect to socket /tmp/dbus-hPAdop8fkv: Connection refused Aug 6 08:47:14 gandalf bonobo-activation-server (nilsfr-18699): could not associate with desktop session: Failed to connect to socket /tmp/dbus-hPAdop8fkv: Connection refused I don't know if this is the consequence of Firefox killing the xsession (or dbus). I have attatched my syslog so you can see what happened around 08:47. ** Attachment added: "syslog" http://launchpadlibrarian.net/53152369/syslog -- Restart session unexpected 10.04 https://bugs.launchpad.net/bugs/581618 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-session in ubuntu. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs