it seems other peaple also had this problem
http://ubuntuforums.org/archive/index.php/t-486444.html
I installed Ubuntu 9.1, upgraded my kernel to 2.6.31-15-generic and it is also
there.
wicd, gnome network manage all suffer from the problem.
** Also affects: linux (Fedora)
Importance: Undecided
Status: New
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unable to create ad-hoc connection with networkmanager
https://bugs.launchpad.net/bugs/481628
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