6

I installed the new version on my new computer and I want to change the lockscreen background I have done this before in the 18.04 LTS version by modifying the /usr/share/gnome-shell/theme/ubuntu.css file but on this new version it has changed to /usr/share/gnome-shell/theme/gnome-shell.css and I modified the #lockDialogGroup selector from this:

#lockDialogGroup {
    background: #2e3436 url(resource:///org/gnome/shell/theme/noise-texture.png);
    background-repeat: repeat;

to this:

#lockDialogGroup {
    background-image: url(file:///home/mauriciogtz/Pictures/Wallpaper.jpg);
    background-repeat: no-repeat;
    background-size: cover;;
    background-position: center; }

but I can't get it to work and I have already restarted my computer.

pomsky
  • 68,507
Mauricio Gtz
  • 100

4 Answers4

13

in Ubuntu 19.04

the file /usr/share/gnome-shell/theme/Yaru/gnome-shell.css will do what you are looking for.

enter image description here

enter image description here

Edit on 10th Jan 2020

you may also have a detailed look on this page https://github.com/PRATAP-KUMAR/login-lock-screen-bg-change for setting the backgrounds via script for Ubuntu 18.04, 19.04 & 19.10

PRATAP
  • 22,460
2

You can change lockscreen wallpaper by Settings

aviral dobhal
  • 134
2

Some notes about the tip. In my case, Ubuntu 19.04 on May 22, I need to use quotations on file name image. The image below is on the same folder than /usr/share/gnome-shell/theme/Yaru/gnome-shell.css file.

#lockDialogGroup {
  background-image: url("ironman_login_wallpaper.jpg");
  background-repeat: no-repeat;
  background-size: cover;;
  background-position: center; }
Fernando Gottlieb
  • 21
1

You can modify the file /etc/alternatives/gdm3.css also.

enter image description here

M.A.K. Ripon
  • 3,139
Yacheng Kang
  • 11