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How to upgrade kubuntu 16.04 -> KDE neon
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kubuntu-to-neon.md

This worked for me and might not work for you. It's a seriuos change to your system, you need to be familiar with apt and with fixing missing or invalid dependencies.

Try it at your own risk!

Uninstall any KDE or Plasma related package

apt purge kubuntu-desktop plasma-desktop kde-baseapps kde-runtime kubuntu-driver-manager
apt autoremove

If you have any KDE PPA, delete it. I had kubuntu backports, so:

rm /etc/apt/sources.list.d/kubuntu-ppa-ubuntu-backports-xenial.list

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/lts
$ sudo apt-get update
$ sudo apt-get install neon-desktop

A few little fixes

dpkg-reconfigure sddm
apt install kde-config-gtk-style kde-config-gtk-style-preview plymouth-theme-breeze grub-theme-breeze

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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