New Ubuntu and Linux Mint wallpaper. Lovely green field and cows. Posted: August 17, 2013. At: 10:13 PM. This was 4 years ago. Post ID: 6138 John Cartwright August 17, 2013 1 Comment Green field Ubuntu wallpaper. This is a lovely green Ubuntu wallpaper for your desktop. This is an amazing wallpaper with good detail in the background.