Find the JPG file you want to use and copy it over the top of the existing default file /usr/share/backgrounds/linuxmint/linuxmint.jpg
$> sudo cp -f
Update:
Use this command to set any wallpaper to your lockscreen when using Cinnamon.
gsettings set org.cinnamon.desktop.background picture-uri 'file:///home/username/Pictures/your-wallpaper.jpg'
Tips:
* Check your desktop environment: Run echo $XDG_CURRENT_DESKTOP to confirm if you're using Cinnamon, MATE, or Xfce
* Default locations: System wallpapers are usually in /usr/share/backgrounds/
* Permissions: Make sure the wallpaper file has appropriate read permissions
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