Try this:
sudo apt-get remove skrooge
sudo apt-get remove skrooge-kf5

Edit the sources and remove all ppa relative to skrooge.

Then:
sudo add-apt-repository ppa:s-mankowski/ppa-kf5
sudo apt-get update
sudo apt-get install skrooge-kf5

You said:
"Edit the sources and remove all ppa relative to skrooge."

What does this mean? sorry I am not a linux, ubuntu or kde specialist.
Could you precisely tell me what to do. Thanks

From you software manager (Discovery or something else), you should be able to edit the sources.
From a console run:
sudo software-properties-kde
or
sudo software-properties-gtk

Then remove all source relative to skrooge (or smankowski).

Try this:
sudo apt-get remove skrooge-kf5
sudo apt-get remove skrooge
sudo apt-get update
sudo apt-get install skrooge-kf5