'warty-final-ubuntu.png' (in honor of the first Ubuntu release, 4.10 "Warty Warthog"), but this PNG image actually became a JPEG one sometime in 2008!The following "bug" still affects the "ubuntu-wallpapers" package versions found in the current Ubuntu stable (13.10 "Saucy Salamander") and development release (14.04 LTS "Trusty Tahr") repositories:
https://bugs.launchpad.net/bugs/296538
Nobody cares. Enjoy! :)
