Related: SSH Agent on WSL/Ubuntu 17.10
Since Ubuntu gave up on Mir Desktop and left Unity Desktop behind, here is a workaround for an Ubuntu/Wayland GUI sudo permissions issue in Ubuntu 17.10.
Wayland X11 permissions error
The error message received for say:
No protocol specified. Unable to init server **: cannot open display: :0.
xhost +si:localuser:root > /dev/null