Old bug, just tripped me up after upgrading to Ubuntu 17.10, now can't
open a .epub file but I can open it via a link (ln -s xyz.epub xyz.tgz).

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  file-roller cannot open filetypes with derived mimetypes (e.g. epub
  and ods files)

Status in file-roller package in Ubuntu:

Bug description:
  Given three files A, B and C, where A is a zip file (a.zip), B is an
  ePub file (b.epub) and C is an ODF Spreadsheet file (c.ods) ...

  All files have "Open With > Archive Manager" as a menu option in

  This is likely due to the shared-mime-info database having the ePub
  and ODS mimetypes as <sub-class-of type="application/zip"/>.

  File A will open successfully, while files B and C report "Could not
  open 'A'" / "Archive type not supported". However, renaming B and C so
  they have a .zip extension will cause the files to be opened

  This is likely due to file-roller checking the filetype to load by
  extension, not magic. This is indeed the case as giving a text file a
  .zip extension causes file-roller to report "An error occurred while
  loading the archive" (End-of-central-directory signature not found.
  Either this file is not a zipfile, or it constitutes one disk of a
  multi-part archive.  In the latter case the central directory and
  zipfile comment will be found on the last disk(s) of this archive.)

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: file-roller 3.2.1-0ubuntu1
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  ApportVersion: 1.23-0ubuntu3
  Architecture: amd64
  CheckboxSubmission: 5434425585a31b50d9fa7c3153a37fe1
  CheckboxSystem: b845c366ea09c60efa3a45c1b5b21525
  Date: Mon Nov  7 21:12:54 2011
  InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta amd64 (20100318)
   PATH=(custom, no user)
  SourcePackage: file-roller
  UpgradeStatus: Upgraded to oneiric on 2011-09-24 (44 days ago)

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