logg in as user root from the GUI

[robert]

Hi there,

to test things I normally use on my remote servers I installed a virtual 
box with ubuntu mate (ubuntu mate because it handles my 4k laptop screen 
with ease).

Now I would like to be able to log in as user root from the gui, so I do 
not have to su into a bash shell to work as root.


how can I do that?

thanks

robert