Comment 33 for bug 643788

Here is the best solution:

http://ubuntuforums.org/showthread.php?t=1598930&page=13

"Hi, I have a better solution for everyone trying to use this patch that isn't able to get it working. You should go and download the svn package from aircrack-ng. first download the package for svn by running this in terminal.
svn co http://trac.aircrack-ng.org/svn/trunk/ aircrack-ng
then browse to that folder with cd and sudo make && make install"