This is entirely experimental and not meant for general consumption!
# Install the snap snap install --edge --devmode plasma-desktop # Put a supporting xsession desktop file into place sudo wget https://metadata.neon.kde.org/snap/plasma-snap.desktop -O /usr/share/xsessions/plasma-snap.desktop
Then logout and you should find "Plasma Snap" listed as session option. Logging into that session should bring up the snapped Plasma running against a separate dbus session connection inside the snap.
Currently not working. Wayland is not working properly because XWayland cannot be started because X11 cannot be started from inside the snap. The actual reasons of this are unclear but possibly related to relocatability problems. Notably kwin_wayland will crash because XWayland doesn't start.
Testing Plasma pre-releases is often times not possible without building from source. Also upgrading an actual production system to a pre-release is a daunting and risky task. Putting plasma into a self-contained and confined bundle can make testing releases much easier.