Applies to: 

Centrify Suite 2016.1 (DirectControl 5.3.1) on supported Ubuntu and Debian platforms


Problem: 

After installing DirectControl 5.3.1 on a Ubuntu machine and restarting it, the following error is displayed. 

The system is running in low-graphics mode
Your screen, graphics cards, and input device settings could not be detected correctly. You will need to configure these yourself.

In addition, the /etc/lightdm/lightdm.conf file contains the following line: 

\n[SeatDefaults]\ngreeter-show-manual-login=true\n

As a result, users are unable to login through GUI. Console and SSH logins are not affected. 


Cause: 

This is caused by the generated lightdm.conf file which contains an invalid configuration parameter. 


Workaround: 

Replace the incorrect configuration parameter with the following: 
 

[SeatDefaults]
greeter-show-manual-login=true

A command similar to the following can also be deployed after installing DirectControl agent to workaround this issue: 
 

sed -i 's/\\n/\n/g' /etc//lightdm/lightdm.conf