kali@kali:~$ sudo airmon-ng start wlan0

PHY Interface Driver Chipset

phy2 wlan0 rt2800usb Ralink Technology, Corp. RT5372

Failed to set wlan0mon up using ip

(mac80211 monitor mode vif enabled for [phy2]wlan0 on [phy2]wlan0mon)
(mac80211 station mode vif disabled for [phy2]wlan0)

kali@kali:~$ sudo iwconfig
lo no wireless extensions.

wlan0mon IEEE 802.11 Mode:Monitor Tx-Power=20 dBm
Retry short long limit:2 RTS thrff Fragment thrff
Power Managementff

eth0 no wireless extensions.

kali@kali:~$ sudo airodump-ng wlan0mon
ioctl(SIOCSIFFLAGS) failed: No such file or directory
Failed initializing wireless card(s): wlan0mon

i'm super new to this type of stuff and i got quite a few things running well a couple weeks ago. I am running VirtualBox, with a PAU06 Wireless Adapter from Panda Wireless.