To open Microsoft .pps powerpoint format, Ubuntu 14.04 uses LibreOffice standard.
Which setting is required to autostart directly the slideshow.
when Impress is launching by clicking a Microsoft .pps file itself ?
Usually browsers or mail programs can download the .pps file and then start the slideshow rightaway with a minimum of mouse clicks or none more clicks at all.
I use latest Ubuntu 14.04 , Thunderbird and Libre Office.