U2's latest album 'No Line On The Horizon' hasn't been doing as well as frontman Bono would have liked, with the singer admitting he's rather disappointed by the album's lack of commercial success.

"We weren't really in that mindset and we felt that the album was a kind of an almost extinct species, and we should approach it in totality and create a mood and a feeling, and a beginning, middle and an end. And I suppose we've made a work that is a bit challenging for people who have grown up on a diet of pop stars," he told spinnermusic.

'No Line On The Horizon' did however, break a rather unwelcome record. It's the groups lowest selling album in over ten years, clocking in just one million unit sales, in comparison to 2004's 'How to Dismantle An Atomic Bomb' which sold 3.2 million copies, and 2000's 'All That You Can't Leave Behind' with 4.3 million unit sales.