Updating to Ubuntu 18.04

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This guide will show you how to upgrade to the latest version of ubuntu

Login via VNC and then run the below commands

apt update && apt dist-upgrade

apt install update-manager-core

Next,

do-release-upgrade 

If that didn't work, try:

do-release-upgrade -d

Hit 'N' and enter

once the update is complete, login again and run the following commands:

apt autoremove

apt update

apt dist-upgrade

And update should be done