Where I can found all the desktop wallpapers
deb packages of all the versions of Ubuntu releases?
However I've found deb package of Ubuntu wallpaper contest 14.04 Trusty Tahr on web previously with URL
wget https://launchpad.net/~atareao/+archive/atareao/+files/trusty-tahr-wallpaper-contest_0.0.1-0extras14.04.0_all.deb sudo dpkg -i trusty-tahr-wallpaper-contest_0.0.1-0extras14.04.0_all.deb
Now I want to install Ubuntu 15.04 wallpapers without a distro-upgrade.