GDM Background: Change Ubuntu 20.04, 20.10 Login Screen Background Easily - Tired with the purple background on Ubuntu's login screen?. Well, you're not alone. gdm3 is not my favorite display manager, to be honest. I like the minimalistic design, but with just a purple color, it's kinda boring for me.

So today, I'm gonna show you a quick Linux tip to change the login screen background on Ubuntu 20.04 LTS, which uses GNOME 3.36 as its default desktop environment with GDM background.

Sugested read :

Unlike SSDM on Plasma desktop, GNOME doesn't let you customize it (at least out of the box). There's no setting to change GDM3 login screen background unless hacking on the the style sheet file.

Change Login Screen Background Ubuntu 20.04 LTS

It was fairly straightforward to edit the content in Ubuntu 18.04 and Ubuntu 19.10. In Ubuntu Focal, we have to extract the css from .gresource file, edit the content, and recompile it to make a new .gresource file.

Customizing GDM3 Login Screen Background

Thankfully, there's a simple graphical tool made with GTK3 in C to change the GDM 3 background image of Ubuntu 20.04 LTS Focal Fossa that created by Thiago Silva to make things easier.

This doesn't work anymore bacause the repository has been disabled by Thiago Silva. For newer workaround, please check my UPDATED VIDEO on how to customize GNOME login screen background.

Please note, gdm background won't work with older versions of Ubuntu. It also won't work if your system is set to a custom gdm3 theme. You will have to reset to the default configuration of gdm3 before using GDM Background.

As usual, open the Terminal, then run the following commands :

sudo apt install git make gcc libgtk-3-dev libpolkit-gobject-1-dev
git clone
cd gdm-background/
sudo make install

You can now open GDM Background via application launcher. The program is pretty simple to use tho.

All you need to do is open file manager to browse your preferred image > drag and drop it onto the GDM Background's window > click Set > enter your password to continue > restart GDM.

Tip : If you are stuck in a login loop, just reboot your computer. It should fix the issue. Since the text is white, avoid applying a light white background.

You can always revert to the default Ubuntu purple theme by clicking on the Restore button. Hope this guide helps you to change the login screen background on Ubuntu 20.04 LTS. Thanks for reading!.