Install latest/edge of plasma-desktop-session
Ubuntu 16.04 or later?
Make sure snap support is enabled in your Desktop store.
Install using the command line
sudo snap install plasma-desktop-session --edge
Don't have snapd? Get set up for snaps.
Strictly confined Plasma and Ubuntu desktop sessions for KDE Neon Core.
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Choose your Linux distribution to get detailed installation instructions. If yours is not shown, get more details on the installing snapd documentation.