Upgrade from Ubuntu 16 to Ubuntu 18

This is more to aid my memory than anything else, as it is something we do for the 300+ servers on a regular basis that I help to host.

sudo apt-get update
sudo apt-get upgrade
sudo apt dist-upgrade
sudo apt-get autoremove
sudo apt install update-manager-core
sudo do-release-upgrade

Once upgrading to Ubuntu 18 it is good to note that Apache and PHP will stop working. The fix for this is to re-install the php and libapache2 php mod after the upgrade

sudo apt install php
sudo apt install libapache2-mod-php

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