How to restart KDE 5 interface?

In a terminal (ctrl+alt+Fx if KDE is stuck to use tty) type :

$ kquitapp5 plasmashell

and eventually

$ plasmashell

to restart or

$ kstart plasmashell

if you want to be able to logout of the tty.

For >=kde5.10 (Kubuntu20.04; plasmashell 5.18.5):

Open a console CtrlAlt+T

kquitapp5 plasmashell
kstart5 plasmashell&

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