You might have come across this headline, especially if you working with Oracle Virtual box machines, machines those are cloned from previous setups etc.
To resolve the issue, just remove the file /etc/udev/rules.d/70-persistent-net.rules and reboot the machine. This file contains the MAC address details associated with the machine. If you don’t want to reboot the machine, run the below command :
udevadm trigger --subsystem-match=net
This command will trigger the rules again.