IMPORTANT NOTE: Does not work under Wayland
The way is by using pkexec. For this to be possible, we must create an execution policy, which will go in a file that we will locate in /usr/share/polkit-1/actions/. This file will be:
sudo nano /usr/share/polkit-1/actions/nautilus-root.policy
…and inside, copy:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE policyconfig PUBLIC "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN" "http://www.freedesktop.org/standards/PolicyKit/1/policyconfig.dtd">
<policyconfig>
<action id="org.freedesktop.policykit.pkexec.run-nautilus">
<description>Run Nautilus As Admin</description>
<message>Authentication is required to run Nautilus As Admin</message>
<defaults>
<allow_any>no</allow_any>
<allow_inactive>no</allow_inactive>
<allow_active>auth_admin_keep</allow_active>
</defaults>
<annotate key="org.freedesktop.policykit.exec.path">/usr/bin/nautilus</annotate>
<annotate key="org.freedesktop.policykit.exec.allow_gui">TRUE</annotate>
</action>
</policyconfig>
Then, to run nautilus as root:
pkexec nautilus
The RebornOS Team