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How to change login screen background in Ubuntu

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You may get bored with ordinary purple-colored background screen whenever you login into your computer. To replace this purple-colored background to your favorite background screen it is not as easy as in Windows. Steps to change login screen background in Ubuntu: Step 1: Copy your favorite background image and paste in below mentioned folder:
/usr/share/backgrounds
or type this command in terminal and enter your password.
sudo cp Path_of_Image/NAME_OF_THE_FAVORITE_IMAGE /usr/share/backgrounds/
Step 2: We need to modify a CSS file which is responsible for the background image. Open the terminal and paste this command and you will able to see a CSS file.
  • For ubuntu 17.10
    xhost +local: && sudo gedit /etc/alternatives/gdm3.css
  • For ubuntu 18.04
    sudo gedit /usr/share/gnome-shell/theme/ubuntu.css
Step 3: Press ctrl+f and you will see insert box at top right corner of the window. Type #lockDialogGroup in the box then you can see the “#lockDialogGroup” highlighting on the screen. Step 4: Find out the following section.
#lockDialogGroup {
  background: #2c001e url(resource:///org/gnome/shell/theme/noise-texture.png);
  background-repeat: repeat; }
Replace this with following:
#lockDialogGroup {
  background: #2c001e url(file:///usr/share/backgrounds/NAME_OF_THE_FAVOURITE_IMAGE);
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center; }
Write your image name in place of “NAME_OF_THE_FAVORITE_IMAGE” in the above section and save the file. Step 5: Restart the computer and you will find your favorite background screen at the time of login.

Last Updated : 30 Sep, 2022
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