Unity is a graphical shell for the Gnome desktop environment developed by Canonical Ltd. for its Debian based Ubuntu distribution of Linux. Unity debuted on the netbook edition of Ubuntu 10.10 but is still the default choice in Ubuntu 16.
This guide will demonstrate how to change the lock screen wallpaper.
Method 1: Change the Wallpaper
- Open System Settings by clicking the gear in the upper right corner of the screen, and then clicking System Settings.
- Click the Appearance applet to open background settings. Select a background to change your desktop wallpaper and the lock screen wallpaper.
Method 2: Modify the UNITY configuration
- Click the Ubuntu icon at the top of the Dock on the left side of the screen and type Terminal into the search box. Click the Terminal icon to open it.
- In the terminal window enter:
sudo nano /usr/share/glib-2.0/schemas/10_unity_greeter_background.gschema.override
- Enter your sudo password. When the editor opens, add the following lines after the last text in the file.
- Replace /home/user_name/Pictures/picture_name.png with the full path of the image file you would like to use for the lock screen. Hit CTRL + X and Press Y to save and exit. Then reboot and test.