If rootsh won't install, I have no idea what's up with that. Try sudser or something.

Not sure, but if airmon-ng is a script, it may want bash installed (if you have file installed, as root, "file `which`/airmon-ng" (if that fails, just run file with the full path to airmon-ng) may be enough to tell you what it is). Or I may have just forgotten to mark it executable....

Not sure though, sorry, as I only ever used Kismet + aircrack-ng.