# echo 'deb http://build.i3wm.org/ubuntu/raring raring main' >> /etc/apt/sources.list +# echo 'deb http://build.i3wm.org/ubuntu/trusty trusty main' >> /etc/apt/sources.list # apt-get update # apt-get --allow-unauthenticated install i3-autobuild-keyring # apt-get update # apt-get install i3