add "net.ifnames=0" to GRUB config file /etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash net.ifnames=0"

#GRUB_CMDLINE_LINUX="net.ifnames=0"  #optional

sudo update-grub

sudo reboot
OR
systemctl reboot

after reboot you may see instead of enp0s3 (or similar) again the eth0:
ifconfig

check results after reboot:
cat /proc/cmdline


More reading at
https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/