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I made a major mistake by putting in this code: 

vim /etc/lightdm/lightdm.conf

and then changing the line 

greeter-session=unity-greeter

to

greeter-session=lightdm-gtk-greeter

But now I get a low graphics error. I found some answers on how to fix this, but I am struggling with opening the terminal to do it. The instructions on this website How to change the LightDM theme/greeter? would be helpful if I could get into the terminal, but when I press Ctrl+Alt+F1 nothing happens except the cursor freezes.

So I am looking for a workaround and I considered changing grub as the terminal does open up there. But I ran into a new problem - grub does not recognize sudo and other commands.

Zanna
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BJsgoodlife
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1 Answers1

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If you can get to grub menu, you can choose to boot in recovery mode. Do it.

Then choose the option "root"

There you can run

mount -o remount,rw /
nano /etc/lightdm/lightdm.conf

and edit this file. Then press Ctrl+O to save and Ctrl+X to exit.

Then run 

reboot
Pilot6
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  • @Pilot6-It doesn't work yet but I was able to follow your commands. What I am thinking is the greeter-session is worded wrong somehow. I was able to find the configuration file. It is /usr/share/lightdm/lightdm.conf.d/50-unity-greeter.conf – BJsgoodlife Jul 14 '15 at 19:39