fbreader binary package in Ubuntu Focal riscv64

 FBReader is an e-book reader.
 .
 Main features:
  * supports several open e-book formats: fb2, html, chm, plucker,
    palmdoc, ztxt, tcr (psion text), rtf, oeb, openreader, non-DRM'ed
    mobipocket, plain text, epub, eReader
  * reads directly from tar, zip, gzip, bzip2 archives (you can have
    several books in one archive)
  * supports a structured view of your e-book collection
  * automatically determines encodings
  * automatically generates a table of contents
  * keeps the last open book and the last read positions for all open books
    between runs
  * automatic hyphenation (patterns for several languages are included)
  * searching and downloading books from www.feedbooks.com and www.litres.ru
  * partial CSS support for epub files

Source package