I intend to self-publish a book on the Kindle platform.
Adobe PDF is one of the supported formats in which you can submit your book.
Since I'm using Ubuntu, is it possible for me to use LibreOffice and convert my LO file to Adobe PDF?
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Certainly it is possible. Just write your book in LibreOffice Writer, save it, and export it to PDF using the built-in export function, which even has its own button.
PDF is not a good choice for a kindle ebook. It's perfect for a print version, but for ebooks you'll better take the rtf approach.