[Solved] Interface *mon is too long for linux so it will be renamed to the old style (wlan#) name.

If you tried to start monitor mode in a wireless interface, probably you will see the following message:

Interface wlx6466b31e7738mon is too long for linux so it will be renamed to the old style (wlan#) name.

 , where 6466b31e7738 is the MAC address from your interface.

 Just write the following commands in your terminal:

sudo ifconfig wlx6466b31e7737 down
sudo ip link set wlx6466b31e7737 name wlan0
sudo ifconfig wlan0 up

, where wlx6466b31e7737 is your wireless interface.

Now, you could start monitor mode in your interface as follows:

sudo airmon-ng start wlan0

Found 4 processes that could cause trouble.
Kill them using 'airmon-ng check kill' before putting
the card in monitor mode, they will interfere by changing channels
and sometimes putting the interface back in managed mode

    PID Name
   1382 avahi-daemon
   1388 NetworkManager
   1424 wpa_supplicant
   1427 avahi-daemon

PHY    Interface    Driver        Chipset

phy2    wlan0        ath9k_htc    Qualcomm Atheros Communications AR9271 802.11n
        (mac80211 monitor mode vif enabled for [phy2]wlan0 on [phy2]wlan0mon)
        (mac80211 station mode vif disabled for [phy2]wlan0)

Enjoy it!