Ark is installed but there is no option to create an archive in the file manager's context menu.
There is a
As I anticipated this is related to the "hybrid" state of the present Plasma 5.
Not only upgrade from a KDE4 system to Plasma 5 may disable some features, as presented in this question, but installing directly a Plasma 5 system like Kubuntu 15.04 or 15.10 may include similar problems
(as indicated here:
There are KDE4 applications and there are new KF5 applications.The KDE4 parts are looking the service menus from:
~/.kde/share/kde4/services/ServiceMenus/ and /usr/share/kde4/services/ServiceMenus/
The new KF5 service menus are at:
~/.local/share/kservices5/ServiceMenus/ and /usr/share/kservices5/ServiceMenus/*
I used the second solution for 15.10, running this command:
sudo ln /usr/share/kde4/servicetypes/konqpopupmenuplugin.desktop /usr/share/kservicetypes5/konqpopupmenuplugin.desktop