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So far, I can find sufficient answers telling how to add a "run as root" to right click menu in nautilus. However, with caja, as expected, doesn't work to use the same technique as with nautilus
Ubuntumate 16.04 running on Raspberry Pi: There is no option to "run as root". However, inputing "gksu caja" in the terminal does work to open a folder as root.
Required, but never shown