eth0 error after installing Ubuntu Server 14.04.3 due to re-named eth0

[compdoc]

> On booting however the network did not function

Can't say if it's a bug, but you sound like a victim of Consistent Network
Device Naming. What sounds buggy is this happening after the install. 

You can disable it, or learn to live with it. I do a little of both. If this
happens consistently, then report it. 



Consistent Network Device Naming. To prevent renaming of Ethernet cards:

sudo nano /etc/default/grub

Add ' biosdevname=0' to the line:

GRUB_CMDLINE_LINUX_DEFAULT="biosdevname=0"

Then save and run:

sudo update-grub

sudo reboot