If you want to change the MAC address in Ubuntu then follow the instructions below…. Open the terminal. Now suppose : 3x:6b:3c:44:9r:22 is the new mac address you want to assign Then enter the following command into terminal: 123$ sudo ifconfig eth0 down $ sudo ifconfig eth0 hw ether 3x:6b:3c:44:9r:22 $ sudo ifconfig etho up Finally Check the new MAC address by using following command 1$ ifconfig Thank...