Network connections not working after new motherboard installation (Ubuntu 14.04)

Question

So I installed a new motherboard with an existing Ubuntu install and now my network won't connect (wired).

The first help thread I read suggested deleting /etc/udev/70-persistent-net.rules and then rebooting, saying that this file would get recreated on startup. I tried this and rebooted several times but no replacement file is created.

Other recommendations include changing the eth0 string in /etc/udev/70-persistent-net.rules to the new eth, but they don't say where I can see what the new eth # is for the new motherboard.

I've tried ifconfig and noticed the inet6 addr doesn't look like a full address. Not sure if this is a problem.

lo
Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK running MTU:65536 Metric:1
RX packets:1520 errors:0 dropped:0 overruns:0 frame:0
RX packets:1520 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:119430 (119.4KB) TX bytes:119430 (119.4 KB)

New motherboard is a Gigabyte Z170XP-SLI, if that matters.

As per this thread I've checked /var/log/syslog but have found no udev[nnn]: renamed network interface ethN to ethX lines.

Answer 1

I am assuming all other components - I/O devices, microprocessor, disks, sound or graphics card remains the same and only Motherboard is changed. While installing Ubuntu many times on various machines - I have looked into the logs and there are lots of drivers in kernel as well as packages to support those devices. I will say it will be a good idea to have a backup of your data and then do a reinstall. Once you have a stable system you can get your data from backup storage. Fixing one problem after the other might take a lot of efforts in my opinion.