macchanger -r wlan0 error

[ghost]

I'm using alfa network awus036ach and is working well but i want to change my mac address and when i give this command it gives me an error.

sudo macchanger -r wlan1

Current MAC: xx:xx:xx:xx:xx:xx (ALFA, INC.)
Permanent MAC: xx:xx:xx:xx:xx:xx (ALFA, INC.)
[ERROR] Could not change MAC: interface up or insufficient permissions: Operation not permitted

[jeffro87]

a little late, try this
ifconfig wlan1 down
macchanger -r wlan1
ifconfig wlan1 up

[qkum]

Possible fixes:
1#It pops up if the interface (wlan0) is already in use in another window. - stop the other program/process using the wireless interface.
2# try with "sudo" in front - as I now see you tried.
3# do as the comment above said, take down the interface and change the mac address manually:
ifconfig wlan1 down
macchanger --random --bia wlan1
ifconfig wlan1 up

Explanation:
--random = random maccaddress,
--bia = pretends to be a real burned in mac address.