How can I elevate nautilus privileges to move or copy a folder as root?

As far as I can say, based on what I know and have experienced:

sudo is used for command line applications/commands and gksudo is useful when you try to run a program using the Run Application dialog window by pressing Alt+F2.

I have read that gksudo is just the graphic version of sudo.

Anyway, you can both drop sudo nautilus and/or gksu nautilus in a terminal for the purpose to do what you wish, having the same effect both commands. But if you want to omit the terminal and you wish to run it directly with the "Run Application" dialog window, just press Alt+F2 and write gksu nautilus, after which you will be prompted to enter your password, then the nautilus file browser will open with root privileges.

Additionally, you can achieve to open files/folders as root with a single click by using the "Open as Administrator" option via right click. Which in any case will open a new nautilus instance for the given folder and will open files as root, this may also open/run applications as root but I haven't tested it yet.

You can get the "Open as Administration" option in your contextual menu by installing nautilus-gksu via command line: sudo apt-get install nautilus-gksu or by using synaptic as shown in the next image:

Good luck!

you need to run Nautilus as root

type this in the terminal

gksu nautilus

now you can move using the GUI.

or use this command

sudo mv -r /home/user/temp/<foldername>/ /opt/