Opening 7zip files on Ubuntu 18.04

How to Install the 7zip Utility on Ubuntu 18.04

By default you can not download the p7zip-full package from the repo, as it returns the following error:  Package ‘p7zip-full’ has no installation candidate.   To fix this error follow the steps below

From the terminal

sudo bash

add-apt-repository universe

apt install p7zip-full

p7zip -d filename.7z

Thats it!