VirtualBox - Have to do the following after cloning machine

■ Make a new MAC address

■ Make a new UUID for network

$ uuidgen eth0

■ If there is the error as below.

■ Remove the 70-persistent-net.rules file.

$ rm /etc/udev/rules.d/70-persistent-net.rules

■ Check the configure file of VirtualBox

vim /home/njoonk/.config/VirtualBox/VirtualBox.xml