The album was withdrawn and is considered a "lost" album. There is however a possibility of obtaining the album because it's been released unofficially on bootlegs. There are also several sites that can provide you with MP3 files of all of the individual songs.
The title of the lost album is "The Man and The Journey". Although they performed it live many times, it was never released as a studio album because they ended up using many of the songs from it on "Ummagumma"