root@Alias:~# ifconfig wlan0 up
SIOCSIFFLAGS: Operation not possible due to RF-kill

root@Alias:~# lspci | grep Network
03:00.0 Network controller: Ralink corp. RT5390 Wireless 802.11n 1T/1R PCIe

root@Alias:~# airmon-ng start wlan0


Found 1 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!
-e
PID Name
2405 NetworkManager


Interface Chipset Driver

wlan0 Unknown rt2800pci - [phy0]SIOCSIFFLAGS: Operation not possible due to RF-kill

(monitor mode enabled on mon1)
mon0 Unknown rt2800pci - [phy0]

root@Alias:~# airodump-ng mon0
ioctl(SIOCSIFFLAGS) failed: Operation not possible due to RF-kill

WHAT SEEMS TO BE THE PROBLEM????