Is there any way to open root file browser in raspbian (like
gksudo nautilus in ubuntu)?
You will find that 'mc' ( midnight commander ) is the fastest for browsing and file operations - CTRL+o will give you a root shell prompt to view output of commands. On a Pi, it's lightweight. You don't want to swap to your microSD. Invoke `apt-get -y install mc' . A number of common operations are 'hit-one-key-and-presto!' on the Function keys .
sudo file-manager should be enough to start whatever file manager you have configured. Depending on your setup, you may need to run
xhost + as the user who owns the desktop, to allow root processes to connect to it.
Finally, if your X configuration is really bizarre, you might need to tell the file manager which display it should use, i.e.
sudo DISPLAY=:0 file-manager. Note that this should not be necessary in a normal setup.