Because the mac of the network card in another virtual machine has changed, you can use ifconfig -a to see other ethX, ifconfig up ethX is enabled, and (if necessary) just dhclient ethX. However, this operation needs to be done again every time you restart, so it is recommended to back up and delete /etc/udev/rules.d/70-persistent-net.rules. After restarting, the network card will be automatically re-detected and recognized.
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Because the mac of the network card in another virtual machine has changed, you can use ifconfig -a to see other ethX, ifconfig up ethX is enabled, and (if necessary) just dhclient ethX. However, this operation needs to be done again every time you restart, so it is recommended to back up and delete /etc/udev/rules.d/70-persistent-net.rules. After restarting, the network card will be automatically re-detected and recognized.