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If I changed my desktop background picture, that picture would also be set to login screen. Now it's not working. Whatever I change, login background is the same picture (Ubuntu's default picture) How can I make it work?

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This question has been answered multiple times, here is an appropriate link.

On your behalf I have tried all answers in this thread on Ubuntu 16.10 and I have only had success with one. Unfortunately it's the ugly one.

Firstly, make sure the picture you want to use is in .png format, then open your terminal:

cd /usr/share/backgrounds
sudo cp /directory/path/to/my/picture /usr/share/backgrounds
sudo mv warty-final-ubuntu.png warty-final-ubuntu2.png
sudo mv 'my-picture-name.png' warty-final-ubuntu.png

Then log out to see your new login wallpaper.

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  1. Add a cronjob /etc/cron.d/variety-background-cp that copies the current background image every 10 minutes to a location outside of your encrypted home folder:

    # hourly copy background image
    */10 * * * * your-sername cp "$(gsettings get org.gnome.desktop.background picture-uri|sed "s~'file://\(.*\)'~\1~")" /usr/share/backgrounds/current-background.png
    
  2. Backup the ubuntu theme file with

    cp /usr/share/gnome-shell/theme/ubuntu.css /var/tmp/
    
  3. edit the #lockDialogGroup section in your ubuntu.css, for example

    #lockDialogGroup {
       background: #2c001e url(file:///usr/share/backgrounds/current-background.png);
       background-repeat: no-repeat;
       background-size: cover;
       background-position: center;
    }
    
  4. reboot

see https://askubuntu.com/a/1145846/34298

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