How to upgrade kubuntu 16.04 -> KDE neon
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1. Add the neon repositories and install the neon desktop:

wget -qO - 'http://archive.neon.kde.org/public.key' | sudo apt-key add -
sudo apt-add-repository http://archive.neon.kde.org/user
sudo apt-get update
sudo apt-get install neon-desktop

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2. Upgrade everything. Repeat if necessary, until everything is really up to date and you have no held-back packages:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade

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From: https://gist.github.com/nihathrael/7429eeb8d539c4c8e0ade03269b3f95a
Year Searched: 2020