The new version of Aircrack-ng 1.2 rc3 release has modified the airmon-ng check kill command as follows:
service network-manager stop 2> /dev/null > /dev/null
service NetworkManager stop 2> /dev/null > /dev/null
service avahi-daemon stop 2> /dev/null > /dev/null
To find airmon-ng try:
locate airmon-ng
Open with leafpad
See lines 965-967
MTeams is working on methods to restore these functions thru the command line.
Musket Teams