solved: kde neon, last update: packages have been kept back:

[Stefan Fuhrmann]

Hello all,

Am Dienstag, 16. Mai 2017, 21:02:10 CEST schrieb Valorie Zimmerman:

> On Tue, May 16, 2017 at 11:57 AM, Clay Weber <clay at claydoh.com> wrote:
> > You are using Kubuntu ppas with KDE Neon. The ppa packages are causing
> > conflicts with Neon's packages.
> > 
> > You'll need to remove the Kubuntu ppas from your KDE Neon system to fix
> > this. They are completely unnecessary.

Thanks! That solved the problem!

Stefan