To get an ethX and wlanX back, edit the grub file.

sudo vim /etc/default/grub

Look for :

GRUB_CMDLINE_LINUX and add the following net.ifnames=0 biosdevname=0.

and change from:

GRUB_CMDLINE_LINUX=""

to:

 GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0"

Generate a new grub file using the following command.

sudo grub-mkconfig -o /boot/grub/grub.cfg

Generating grub configuration file ...

Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.

Found linux image: /boot/vmlinuz-4.4.0-15-generic

Found initrd image: /boot/initrd.img-4.4.0-15-generic

Found memtest86+ image: /memtest86+.elf

Found memtest86+ image: /memtest86+.bin

done

Restart PC

from : https://askubuntu.com/questions/767786/changing-network-interfaces-name-ubuntu-16-04 on 06-06-2018