It has been a long time that Ubuntu desktop missing the ‘New Document’ menu option. I don’t know why, but it’s easy to add the feature back.
1. Open terminal either by pressing Ctrl+Alt+T on keyboard or by searching for ‘terminal’ from application menu.
2. When terminal opens, run command:
touch ~/Templates/Untitled\ Document
The command will create a new file Untitled Document in user’s Templates folder.
You can change Untitled\ Document in the command, which will display as the submenu of ‘New Document’. And note that “\” is required if there’s a blank space in it.
That’s it. Enjoy!