Mac Spoofing Kali success, Ubuntu 12.04 failure

Hi all,

I have been able to spoof my mac on my laptop (wireless card QualComm Aetheros ar9845) and connect to my network , that uses mac address filtering, successfully through a Kali Live boot USB
However when I try to do the same in my Ubuntu 12.04 LTS install that I use most often, the connection cannot be made. The mac I am spoofing is that of a device I have already whitelisted in the router, and it can connect on its own properly. That device is always off when I test to better simulate a lab enviroment.
Commands used:
root@kali:~# ifconfig wlan0 down hw ether "my new mac"
root@kali:~# ifconfig wlan0 up

This set always has worked without fault in Kali, but Ubuntu has failed and I have used both this and installed and used macchanger to try and solve it to no avail.
If anyone has any ideas or anything at all that can help me it would be greatly appreciated. Ive been rather stumped by this and hope to solve it. Thank you

Gravep