Ubuntu has this ugly wallpaper you use (I mean purple) as a default wallpaper for GDM, but the truth is I don’t even like to see it in that short moment when I log in to my laptop.
So let’s learn two ways to change this wallpaper for one that we like more or that is more in line with the wallpaper we use on the desktop.
First of all, we need to understand that Ubuntu uses the appearance of GDM with themes, so it’s not normally possible to change the look of this one without changing the whole theme, but the Ambiance theme is pretty cool and I don’t think, like me, that they want to change it.
This theme uses the default background image
, Which is the image we see as the default background in Ubuntu (Yes, this scary purple).
So by simple logic, one of the methods to use to change the default GDM wallpaper is to change this image to one that we like and want to see every day when starting our computer. So we follow the next steps to achieve the change.
- We do a BackUp of the purple vomit of canonical:
sudo cp /usr/share/backgrounds/warty-final-ubuntu.png /usr/share/backgrounds/warty-final-ubuntu-bak.png
- We copy the new background we want to use to directory
with the same name as the previous image:
sudo mv /ruta-de-la-imagen/nombre-de-la-imagen.png /usr/share/backgrounds/warty-final-ubuntu.png
- We log out to see the changes made.
Note: this can be used in any version of Ubuntu, just be sure to use the name that uses the default wallpaper that your Ubuntu uses.
That’s all, see how easy it is?
Now let’s go with the difficult method …
An application that allows us to make almost any change in GDM for Ubuntu, is Ubuntu Tweak, Here I will show you how to specifically change the default wallpaper for GDM, but feel free to move it as long as you want to damage the system and have to go back to the block to know how to fix it.
- We will install Ubuntu Tweak following the instructions described in this post.
- We open Ubuntu Tweak which can be found in the menu Applications> System Tools> Ubuntu Tweak.
- Once on the Ubuntu Tweak home screen, click on the Connection Preferences option found in the menu on the left.
- Once on the Connection Preferences screen, we need to unlock it in order to use it, we do this by clicking on the button that says Unlock at the bottom right of the window.
- Well, we can choose the wallpaper to use, we do this by clicking on the small image that has the Ubuntu wallpaper.
- In the selection window we choose the image we will use and press the button to open.
Note: note that GDM can only use images located in the directory
, So if they want to use custom or downloaded images from the internet they must first save or copy them in this directory.
- Since the GMD wallpaper has changed, we can now log out of Ubuntu Tweak and log out to see the changes made.
Personally, I recommend using Ubuntu Heavy Metal wallpapers, combined, they get a nice effect when starting our computer.