Linux and ChromeOS are not the same. The ChromeOS is a glorified Google Terminal.
Also some Chromebooks are ARM based, which makes installing Linux instead of ChromeOS a little harder. Often more niche packages for Linux ARM need built from Source. See Raspberry Pi and Calibre.
An epub is a distribution, publishing and consumption format. Madness to use it as a source. If you are writing on Linux, then LO Writer and odt format is the source, then an extra Save As in docx (never edit it in LO) for Calibre or Sigil (there is a plugin) and convert to epub.
The only thing crazier than using epub or HTML as a book authoring source is PDF, which is also only for publishing (on paper), distribution and possibly reading on larger screen.
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