While the MacBook Air lasted just 2 minutes, a laptop from Ubuntu has withstood 3 days of hack attacks by some of the world's best at a conference in the US.

The Ubuntu machine was the only machine to hold out during the CanSecWest security conference, where hackers are pitted against each other to find undiscovered flaws in Windows, Mac OS X and Linux.

The Leopard OS X 10.5.2 was first to fall, after a hacker gained access just 2 minutes into the second day of the contest.

According to online reports, the problem was a flaw in Safari.

On day 3 of the competition, the contestants were allowed to try and break into machines using any "popular" piece of software.

And it was Adobe's Flash that proved to be Vista's downfall.

Adobe has been notified of the flaw, while the hacker gets to keep the Fujitsu laptop running Vista Ultimate SP1 that he managed to break in to, as well as pocketing a $5000 prize.

But the Ubuntu 7.10 Linux machine flummoxed everyone.