add LibreOffice to Nautilus right click `create new document` menu

The "Create new document" dialog sources its entries from ~/Templates. Simply put an empty Libreoffice document in that folder or create a subfolder with multiple documents and you will be able to create LO documents from the context menu in Nautilus.

The same method applies to any other type of file, of course.

You can try Nautilus Actions.

Nautilus-action allows you to define custom actions or commands for certain file types or files with names matching your description. There are plenty of things that you can do with nautilus-action.

To install it, just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command(s) below:

sudo apt-get install nautilus-actions

When its done, search for nautilus in Dash, and click on it.

Once it opens, you well see the program, and then you can create a new context menu.