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I tried several time to change my log in screen by using sudo dpkg-reconfigure lightdm. I choose lightdm from here. But my log in screen is unchanged and look like below.Log in screen

How can I change this and back to my default unity log in screen??

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If the command sudo dpkg-reconfigure lightdm not work, edit /etc/lightdm/lightdm.conf file with your favorite editor:

gksudo gedit /etc/lightdm/lightdm.conf

Make sure the greeter-session is the unity-greeter, then restart.


If the problem continue then give a try to this command:

sudo apt-get -o Dpkg::Options::="--force-confnew" install --reinstall lightdm 
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I have tried both of your solution. And when I restarted my PC its showing an error The system is running in low graphics mode. Then I choose low graphics mode and my log in screen appear like this. And icons in dash become bigger in unity. – Scotia 웃 Mar 12 '14 at 6:56
This is a problem in your graphics check this… – Maythux Mar 12 '14 at 6:58
I have no graphics card in my PC. And this is appearing after trying your method. – Scotia 웃 Mar 12 '14 at 7:00
sudo rm /etc/X11/xorg.conf then sudo service lightdm restart – Maythux Mar 12 '14 at 7:02
First command showing rm: cannot remove /etc/X11/xorg.conf': No such file or directory` – Scotia 웃 Mar 12 '14 at 7:03

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