i ran the following :
sudo ifconfig wlp68s0b1 down sudo macchanger -r wlp68s0b1 sudo ifconfig wlp68s0b1 up
Then found no internet connection , in order to restore the connection i ran :
service network-manager restart
but that gives me the old MAC again
my hardware is : Broadcom Limited BCM4313 802.11bgn Wireless Network Adapter (rev 01)
any ideas ?