Re: Kindle Paperwhite and Linux
I have a Kindle Fire and my wife has a second generation Kindle. With both, when connected to my computer via USB cable, the Kindles are mounted as "Kindle" and the contents are accessed as a storage device. Content from your computer can be added to the appropriate folder on the Kindle by dragging and dropping.
The best format for adding books is mobi. Books in other formats can be converted to mobi using a program called Calibre. Calibre is available in the repositories and is an ebook manager as well as a converter.
Ubuntu 15.10 64-bit on HP Envy 17