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I wanted to disable the guest login in my Ubuntu 14.04, so I opened the lightdm configuration file using:

sudo gedit etc/lightdm/lightdm.conf

But the file was Empty (There were NO lines like [SeatDeafaults] etc.. ) So I added following line in that file:

allow-guest=false

and saved the config file and restarted my laptop.

On restart it ran in low graphics mode. So I was unable to try following to restore it to previous state: sudo gedit etc/lightdm/lightdm.conf

Also, after pressing trl+Alt+F1 at window showing message of "Low Graphics Mode", I logged with my credentials and tried

sudo nano etc/lightdm/lightdm.conf

But when I tried to save the changes, it was showing the file doesn't exist. Also failsafeX is not working for me.

CrownedEagle
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1 Answers1

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Create bootable USB Drive with Ubuntu using Startup Disk Creator software (which is pre-installed with stock ubbuntu) on another PC/Laptop.

Boot from this USB drive and select 1st option "Try Ubuntu without installing".

Then Ubuntu Desktop loads up, go to System Settings >> User Accounts.

Create an Administrative account Enable it (by clicking on Account Disabled. You may have to choose a password for this account).

Then log in to this account (by clicking on Wheel icon in the Top-Right of screen then clicking on New Account).

After logging into Administrative account you created on Live Ubuntu on USB Drive, open terminal and type

sudo nautilus

and from there go to Computer>>etc>>lightdm

Open lightdm.conf file in the lightdm folder and add following lines:

[SeatDefaults]

greeter-session=unity-greeter

Now Save the file and Restart the system.

If your problem is due to driver related problems check answers to this question: How to fix “The system is running in low-graphics mode” error?

CrownedEagle
  • 266