Public bug reported: To quote "EPUB 3 Best Practices"
The specification for this is the Open Container Format (OCF) 3.0, and it is literally a .zip file, though it uses the .epub extension. Apparently the coder decided checking the extension was easier than actually looking in the file and recognizing that it is a zip file. Workaround - Use command line unzip ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: engrampa 1.20.0-1 ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18 Uname: Linux 4.15.0-118-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.17 Architecture: amd64 CurrentDesktop: MATE Date: Sat Oct 3 16:53:16 2020 InstallationDate: Installed on 2019-12-22 (285 days ago) InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) SourcePackage: engrampa UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: engrampa (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug bionic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1898396 Title: engrampa archive manager cannot unzip .epub files To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/engrampa/+bug/1898396/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs