Download URLs:
1. http://ubuntuone.com/7hJEOzmP870aOnsFSxlDP9
2. http://dl.cubieboard.org/software/a20-cubieboard/cubian/Cubian-base-r2-arm-a20.img.7z
3. http://mirror.symnds.com/software/cubie/Cubian-base-r2-arm-a20.img.7z
4. https://www.dropbox.com/s/6mc8bbba3qrgecs/Cubian-base-r2-arm-a20.img.7z