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I want to change the Ubuntu Budgie login screen background to the one I'm currently using on my account; Just like it was with the previous Ubuntu versions with Unity with the draw-user-backgrounds option.

I already tried searching for that option or anything with "background" on it with dconf-editor but found nothing.

Open the Login Window app in the menu under Administration.

If it is missing from the menu then install it:

sudo apt install lightdm-settings

Enter your credentials when prompted. Click on the default background image icon, then navigate to /. Click on home>username>Pictures. Select your desired pic, click Open the in upper right corner, close the app. Log off and you will see your desktop background on the Login screen.

Thanks.

I have simple Ubuntu 18.04.1

In my opinion the best way to do this:

step1: make backup of the file /usr/share/gnome-shell/theme/ubuntu.css - if you have another desktop for ubuntu you can find file ubuntu.css just using command locate ==> locate ubuntu.css

step2: vim /usr/share/gnome-shell/theme/ubuntu.css and find part below

   #lockDialogGroup {

   background: #2c001e url(resource:///org/gnome/shell/theme/noise-texture.png);

   background-repeat: repeat; }

step3: change it to

   #lockDialogGroup {

   background: #2c001e url(file:///usr/share/backgrounds/warty-final-ubuntu.png);

   background-repeat: no-repeat;

   background-size: cover;

   background-position: center;

    }

calrification: as you can see, we changed

"background: #2c001e url(resource://" part to the ==> "background: #2c001e url(file://"

and then set up path for the image.

I used /usr/share/backgrounds/ for the path with image. Also I added some css properties to center the image.

This is only the css file configuration. That's it)

I tried all of those and none worked. This does, for sure:

As root user, just copy your_image.png to /usr/share/backgrounds and ....

# cd /usr/share/backgrounds

# cp warty-final-ubuntu.png warty-final-ubuntu.png.stock

# rm warty-final-ubuntu.png

# ln -s your_image.png warty-final-ubuntu.png

# reboot

...where your_image.png is the name of the actual image you want to display. The warty one is big: 4096 x 2304. I matched mine to the same size.

lightdm-settings is a good choice, as well as, you can try

sudo xhost +SI:localuser:lightdm

sudo su lightdm -s /bin/bash

dconf-editor

In dconf-editor find x/dm/slick-greeter you can edit whatever you want

Cheers

• Run Terminal with Ctrl + Alt + T


• Run nautilus with sudo by doing (sudo nautilus) - without the brackets


• Copy your desired background image to /usr/share/backgrounds/


• Go to /etc/alternatives/gdm3.css and open with Text Editor

Change This

  #lockDialogGroup {

  background: #2c001e url(resource:///org/gnome/shell/theme/noise-texture.png);

  background-repeat: repeat; }

To This

  #lockDialogGroup {

  background: #2c001e url(file:///usr/share/backgrounds/yourimage.png);

  background-repeat: no-repeat;

  background-size: cover;

  background-position: center; }

Click 'Save' when you're done.

Restart your PC

After the upgrade to 18.04 I was unable to change the login/lock screen too. So I just replaced the warty-final-ubuntu.png in /usr/share/backgrounds using sudo nautilus with a picture with the same resolution 4096x2304. I renamed it the same : warty-final-ubuntu.png. and deleted the old one. This was fastest and easiest solution...

1. Install gnome-tweak-tool: sudo apt install gnome-tweak-tool




2. Click on the app grid icon, type in: gnome-tweak-tool




3. Open (click on) the gnome-tweak-tool app.




4. Click on "Appearance".




5. On the right-hand pane, find "Background." Click on "image" below it and find the jpg file you want for your Ubuntu background.




6. On the right-hand pane, find "Lock Screen." Click on "image" below it and find the jpg file you want for your Lock Screen page.

Lots of other tools in gnome-tweak-tool that you might like, also.