Comment 4 for bug 1577168

I have notice this today. I am using ubuntu 14.04 (32bits)

3.13.0-92-generic #139-Ubuntu SMP Tue Jun 28 20:42:32 UTC 2016 i686 i686 i686 GNU/Linux

The webbrowser-app is the main affected with this problem.

Console (DISPLAY=:0) freezes and using a ssh to my desktop from a different system I can logging and notice that:

1) console user is gone!

2) sudo update-alternatives --config x-www-browser show:

  Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/bin/epiphany-browser 85 auto mode
  1 /usr/bin/epiphany-browser 85 manual mode
  2 /usr/bin/firefox 40 manual mode

dpkg -l webbrowser-app lightdm
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-============-============-==================================
ii webbrowser-app 0.23+14.04.2 i386 Ubuntu web browser
ii lightdm 1.10.6-0ubun i386 Display Manager

3) lightdm does not restart

4) any app that depends on webbrowser-app will crash the system

5) I can only recover the system console by ssh from other device and using a sudo reboot

This problem might suggest very important vulnerability of ubuntu

Could be related to new updates. Please help!