I was searching for login screens like mac and I got this one


I did everything correctly and suddenly I was told to edit


I opened the file in gedit and I changed it but I couldn't save it - I got the error "you do not have permission to edit this file". I saw from the permissions that only root has permission to edit it, so I ran

sudo su 

which logged me in as root, but I was still not able to complete the edit.

How can I edit and save this file?


You can use gedit or nano (among others) as below

sudo nano /etc/lightdm/lightdm.conf
sudo -H gedit /etc/lightdm/lightdm.conf

Then Ctrl+S for gedit or Ctrl+O for name to save your edits.

Either will do fine, the only difference is that nano is a terminal-based editor while gedit has its own GUI.


Try to open your lightdm.conf file with this command instead with your normal user (not root):

sudo -H gedit /etc/lightdm/lightdm.conf

Open the terminal and enter this code:

sudo -H gedit /etc/lightdm/lightdm.conf

Enter your user password at the prompt.

Edit the file as needed and save it.

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