Airmon-ng
This tool will allow us to terminate the Network Manager as it puts the wireless adapter in managed mode used to only scanning the networks.
Now let’s list the process that may cause a problem with our wireless adapter.
sudo airmon-ng check

As we see we managed to find that the Network Manager is up and running
Now we need to kill the network manager process
sudo airmon-ng check kill

As we see after adding the kill parameter airmon-ng managed to kill the network manager process.
Now let’s follow the as the Network Manager is terminated we need to place our adapter into monitor mode so we will use airmon-ng to do that too!
sudo airmon-ng start wlan0

As we see we managed to put the adapter into monitor mode!
if we want to stop the monitor mode we can specify the stor argument followed by interface name
sudo airmon-ng stop wlan0

check our device information
sudo iw dev wlan0 info