Greetz traceur.

It would seem that airmon-ng is totally brorken. This is because airmon-ng relies upon some switches for 'ps' that are not available for busybox or BB power.

There are only two ways (that I can think of) to fix this problem.

1. Package full-fat ps from debian lenny armel and make aircrack-ng depend on it.

2. Rip airmon-ng apart and make it specific for the n900. Airmon-ng is a generic tool designed to put any card into monitor mode. Thus it has a lot of hardware 'detection' and failsafe routines. The n900 has 1 card. There is only 2 ways to put it into monitor (iw or iwconfig (probably more)). Thus airmon-ng can be modified to be n900 specific.

If you have any interest in updating aircrack-ng I will start on the latter if you cannot be assed with the former (which would be the better solution (less chance of future breakage)).