Please I have problem on my mon0 interface I try different ways but still couldn't fix it. I want to turn on mon0. and here is the outcome.

# airmon-ng start wlan0
Found 4 processes that could cause trouble.
If airodump-ng, aireplay-ng or airtun-ng stops working after
a short period of time, you may want to kill (some of) them!
PID Name
722 avahi-daemon
730 avahi-daemon
775 NetworkManager
834 wpa_supplicant
Interface Chipset Driver
wlan0 Broadcom wl - [phy0]mon0: ERROR while getting interface flags: No such device (monitor mode enabled on mon0)
# airodump-ng mon0
Interface mon0:
ioctl(SIOCGIFINDEX) failed: No such device
root@mbfada-Lenovo-G400:/opt/aircrack-ng# airodump-ng wlan0
ioctl(SIOCSIWMODE) failed: Operation not supported
ARP linktype is set to 1 (Ethernet) - expected ARPHRD_IEEE80211,
ARPHRD_IEEE80211_FULL or ARPHRD_IEEE80211_PRISM instead. Make
sure RFMON is enabled: run 'airmon-ng start wlan0 <#>'
Sysfs injection support was not found either.
# airmon-ng start wlan0
Found 4 processes that could cause trouble.
If airodump-ng, aireplay-ng or airtun-ng stops working after
a short period of time, you may want to kill (some of) them!
PID Name
722 avahi-daemon
730 avahi-daemon
775 NetworkManager
834 wpa_supplicant
Interface Chipset Driver
wlan0 Broadcom wl - [phy0]mon0: ERROR while getting interface flags: No such device (monitor mode enabled on mon0)

2

2 Answers

Ubuntu's network manager is conflicting. You can turn set it to manual using

sudo stop network-manager
echo "manual" | sudo tee /etc/init/network-manager.override

After that you should be able to run

sudo airodump-ng start wlan0

Alternatively, you could also set

unmanaged-devices=interface-name:wlan0;interface-name:mon0

or for a hw address

unmanaged-devices=mac:11:22:33:44:55:66

This can be changed in /etc/NetworkManager/NetworkManager.conf under section keyfile. See also

man NetworkManager.conf

2

Simply killing the processes works. You shouldn't need to unmanage the interface:

As an example:

kill 722 730 775 834
airmon-ng start wlan0

The numbers (pid in the kill) will be different most of the times.

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