Need advice on using Wireshark + aircrack-ng

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http://unix.stackexchange.com – I am making acquiantance with wireless security and attacks and was told to run some tests with aircrack-ng and wireshark. So I installed both of them and ran airmon to switch wi-fi card to monitor mode: sudo airmon-ng start ra0 (this is my DWA-140 usb wi-fi adapter) The wi-fi adapter seems to have restarted after that. Gues that's ok. Still it gave some warnings on processes that might interfere with normal work like network manager, dhclient and a few more. I tried to stop them, but they seem to restart all the time. After that I ran wireshark as a superuser, chose the ra0 adapter and tri (HowTos)