Fixing Ubuntu with No Network
The Linux Tutorial Shows in East Steps How Troubleshooting an Ubuntu 16.04 Xenial Xerus LTS 32/64-bit System with No Network Working.
There are several ways to reactivate the Network of Ubuntu , here we consider the most Easily Running.

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How to Download & Burn Ubuntu Live OS
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Boot the Computer with Ubuntu Live.
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Find Out the New Root Target Drive
Look into the List of the Mounted devices with:df -h
If You can Not to Find it then Try visually with GParted:
sudo gparted
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Possibly Unmount it
sudo umount /dev/sdXN
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How to Chrooting into Ubuntu with Network
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Try a First, System Repair with
apt-get upgrade
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How to Fix Disk Errors Even if Ubuntu Non Bootable
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