|This is a very simple trick that you could improve the security of your system. In short, although it is true that the security of any system also depends on other important factors, the role played by the user is fundamental. In that sense, it can be very prudent change Nautilus background color when run with administrator permissions so that, in this way, there is feeling that something "serious" may happen and why not stop clearly differentiate it from other Nautilus instances that do not have such permits.|
1.- I opened Nautilus with administrator permissions. To do this, press Alt + F2 and I wrote gksu nautilus.
2.- Once Nautilus is open, Edit> Backgrounds and Emblems> Colors. Drag the color that you like the most to the Nautilus window where the files are displayed. It would be advisable to choose a garish color that gives the impression of "danger"; a red or ruby would be fine.
That's it. From now on, Nautilus instances with administrator privileges will be much easier to distinguish from others. In addition, it will prevent the user that something important can happen.