eth0 interface accidentally renamed; now how to fix it

Question

****Raspberry Pi 3. Ubuntu Mate 16.04.****

I was trying to configure a static IP address for the eth0 interface. I followed this tutorial: https://www.howtoforge.com/linux-basics-set-a-static-ip-on-ubuntu

In the end I get :

foo@bar:~$ ifconfig eth0
eth0: error fetching interface information: Device not found
foo@bar:~$ ifconfig enxc914jv7847d6
enxc914jv7847d6 Link encap:Ethernet  HWaddr c3:13:ac:81:34:e4  
      inet addr:192.168.2.142  Bcast:192.168.2.255  Mask:255.255.255.0
      inet6 addr: aa80::f751:32e3:ced5:ca78/64 Scope:Link
      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
      RX packets:12311 errors:0 dropped:0 overruns:0 frame:0
      TX packets:9972 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000 
      RX bytes:9090476 (9.0 MB)  TX bytes:1207456 (1.2 MB)

Evidently the name of the eth0 interface has been changed to some gawdawful alphanumeric string. I prefer if the ethernet interface was named eth0. Why has this happened? More importantly, how to rectify it?

This is not accidental. This is by design in 16.04. Check this solution http://askubuntu.com/questions/814320/how-to-raise-failed-network-interfaces-after-upgrade-to-ubuntu-16-04/814322#814322 — Anwar, Aug 20 '16 at 07:03
Have you tried reverting the changes you were following in the tutorial ? Also, try following the link Anwar provided and rename the interface to whatever suits you — Sergiy Kolodyazhnyy, Aug 20 '16 at 07:27
I did revert the changes I made in /etc/network/interfaces but the interface still has that long, seemingly random name. I am looking at the answer in How to rename network interface in 15.10 right now. Hopefully I can use that to fix my system. — EricVonB, Aug 20 '16 at 07:38
I created a file /etc/udev/rules.d/10-rename-network.rules with the contents SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="ff:ff:ff:ff:ff:ff", NAME="eth0". In other words I did exactly what the answer by richvdh in How to rename network interface in 15.10?. After I rebooted the computer, I ran ifconfig but still the ethernet interface is listed as enxc914jv7847d6. — EricVonB, Aug 20 '16 at 07:54
You replaced the ff:ff:... with the address of your network card from ifconfig right? If you did not then you need to do that and reboot again. — Thomas Ward, Aug 20 '16 at 12:49

eth0 interface accidentally renamed; now how to fix it

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