Ubuntu Guide posted a tutorial about installing FBReader in Ubuntu

FBReader is an e-book reader for Linux/Windows XP PDA/UMPC/desktop computer. FBReader supports several e-book formats: ePub, fb2, chm, rtf, plucker, etc. Direct reading from zip, tar, gzip and bzip2 archives is also supported. Features: supports several open e-book formats:fb2, html, chm, plucker, palmdoc, ztxt, tcr(psion text), rtf, oeb, openreader, non-DRMed mobipocket, plain text, epub, eReader.

  Install FBReader Free E-book Reader in Ubuntu