Lightdm

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GTK+ greeter You can use the lightdm-gtk-greeter-settings gui. Users wishing to customize the wallpaper on the greeter screen need to edit /etc/lightdm/lightdm-gtk-greeter.conf and define the background variable under the [greeter] section. For example:

vim: /etc/lightdm/lightdm-gtk-greeter.conf
[greeter]
background=/usr/share/pixmaps/black_and_white_photography-wallpaper-1920x1080.jpg

To lock the screen

/usr/bin/dm-tool lock