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I am have install Aircrack-ng from its official site. Compiling its source and installing.

And Gerix also from official site Source.

I am using AR9285 with ath9k drivers included default with Ubuntu 12.04

But on Performing injection test its says "mon is on channel -1" and i am unable to perform injection.

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up vote 3 down vote accepted

On the Aircrack-ng homepage you might have missed:

Channel -1 issues

If you are receiving an error message talking about channel -1, you either have to patch your driver like explained in the wiki or get the latest version of Aircrack-ng from our subversion repository and use the option --ignore-negative-one. You can find an installation guide also in the wiki.

If you've already compiled this from SVN, try adding the --ignore-negative-one argument to your injection command.

To have Gerix do that for you, you're going to need to open the script and look for where it calls aireplay (et al).

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Thanks it worked! – BigSack Jun 14 '12 at 4:34

Check if your driver is compatible.

And have a look in the aircrack-ng wiki for the channel-1 issue

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Thanks, my Device is supported out of Box. I have checked then once again. – BigSack Jun 13 '12 at 9:55

Recently I was commissioned to teach someone how to crack wifi, the pc used to perform the wireless audit was Ubuntu 12.04. I had this same issue but was able to overcome the problem by updating the kernel from 3.2 to 3.6. This fixed the problem. I tried a patch and that was unsuccessful. Best of luck, should solve your issues.

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Welcome to Ask Ubuntu! Can you explain (or link to information about) how to upgrade the kernel? (The best place for this would be in your answer itself--you can edit it to add this.) – Eliah Kagan Feb 10 '13 at 23:32

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