Experimente este comando:
echo '[Desktop Entry]
Name=Files
Comment=Access and organize files
Keywords=folder;manager;explore;disk;filesystem;
Exec=nautilus --new-window %U
Icon=system-file-manager
Terminal=false
Type=Application
StartupNotify=true
OnlyShowIn=GNOME;Unity;
Categories=GNOME;GTK;Utility;Core;
MimeType=inode/directory;application/x-gnome-saved-search;
X-GNOME-Bugzilla-Bugzilla=GNOME
X-GNOME-Bugzilla-Product=nautilus
X-GNOME-Bugzilla-Component=general
X-GNOME-Bugzilla-Version=3.6.3
Actions=Window;
X-Unity-IconBackgroundColor=#af4853
X-Ubuntu-Gettext-Domain=nautilus
[Desktop Action Window]
Name=Open a New Window
Exec=nautilus --new-window
OnlyShowIn=Unity;' | sudo tee /usr/share/applications/nautilus.desktop
então
sudo chmod o+x /usr/share/applications/nautilus.desktop