Can not set wlan0 device state to unmanaged.

[jiratto]

After install wfb-ng, There is "unmanaged-devices=interface-name:wlan0" In NetworkManager.conf but when run nmcli tool state has not been changed.

$ cat /etc/NetworkManager/NetworkManager.conf
[main]
dns=default
rc-manager=file
plugins=ifupdown,keyfile

[ifupdown]
managed=true

[device]
wifi.scan-rand-mac-address=no

[keyfile]
unmanaged-devices=interface-name:wlan0