Run KDE 5 Plasma desktop in a Docker container.

• Use x11docker to run image.
• Get x11docker from github: https://github.com/mviereck/x11docker

• Desktop:

x11docker --desktop --gpu --init=systemd -- x11docker/kde-plasma

• Single application (terminal):

x11docker x11docker/kde-plasma konsole

• Single application in Wayland:

x11docker --wayland --dbus x11docker/kde-plasma konsole 

• Plasma destop as nested Wayland compositor:

x11docker --gpu --init=systemd -- --cap-add=SYS_RESOURCE -- x11docker/kde-plasma startplasmacompositor

• Plasma Wayland-only session without X11 in kwin_wayland from host:

x11docker --gpu --kwin x11docker/kde-plasma plasmashell

• Hardware acceleration with option --gpu
• Persistent home folder stored on host with --home
• Shared host folder with --sharedir DIR
• Clipboard sharing with option --clipboard
• Sound support with option --alsa or --pulseaudio
• Language locale settings with --lang [=$LANG]

Look at x11docker --help for further options.