0 Create an Advanced File Manager

In the Ubuntu file system, you can use Nautilus file manager to browse most files but can only write files in your home folder /home/your_name and its sub-folders such as Desktop and Documents. If you have to rename a folder or write files outside of your home folder using the file manager, you won't be able to but you can create an advanced file manager for this purpose.

1. Go to System > Preferences > Main Menu
2. Select "Accessories" in the left panel and click "New Item" in the right panel.
3. Enter a name such as Advanced Nautilus in the "Name" box.
4. Enter gksu nautilus in the "Command" box.
5. Click the "OK" button and the "Close" button.

Now you can go to Applications (or Main Menu) > Accessories and see that the Advanced Nautilus is ready for use. But be careful since you can use it to delete or change any files on your system.