Airmon-ng check
Some processes,
many of which start automatically,
are known to interfere with the tools in the Aircrack-ng suite
and other tools using interfaces in monitor mode.
For example,
Network Manager will put a wireless interface back into managed mode
and hop on different channels scanning for networks.
It's important to identify and terminate processes like Network Manager.
The Airmon-ng check parameter checks for, and lists, these processes.
This output indicates our system is running Network Manager,
dhclient,
and WPA Supplicant.
Running Airmon-ng with the check kill parameter
first tries to stop known services gracefully
then kills the rest of the processes.