What repository should I add? Someone has already done it? And is User Edition stable ?

Hi,

To switch from LTS to user edition perform a repo switch. Your /etc/apt/sources.list.d/neon.list has to look like this:

deb http://archive.neon.kde.org/user xenial main
deb-src http://archive.neon.kde.org/user xenial main

Did it twice yesterday, once in virtualbox, that one was smooth, the next one was on my daily driver and that one had issues.
While updating I had held packages regarding libxkbcommon-x11-0, but i was able to solve it via the following url:
http://askubuntu.com/questions/878918/d ... on0/879038

System information now shows I have Neon 5.9 LTS but it is working fine.