https://bugzilla.redhat.com/show_bug.cgi?id=1903583 sports the following traceback: Traceback (most recent call last): File "/usr/bin/ebook-convert", line 20, in <module> sys.exit(main()) File "/usr/lib64/calibre/calibre/ebooks/conversion/cli.py", line 401, in main plumber.run() File "/usr/lib64/calibre/calibre/ebooks/conversion/plumber.py", line 1135, in run pr(0., _('Running transforms on e-book...')) File "/usr/lib64/calibre/calibre/ebooks/conversion/plumber.py", line 67, in __call__ self.global_reporter(global_frac, msg) File "/usr/lib64/calibre/calibre/ebooks/conversion/cli.py", line 288, in __call__ self.log('%d%% %s'%(percent, msg)) File "/usr/lib64/calibre/calibre/utils/logging.py", line 179, in __call__ self.info(*args, **kwargs) File "/usr/lib64/calibre/calibre/utils/logging.py", line 171, in print_with_flush self.flush() File "/usr/lib64/calibre/calibre/utils/logging.py", line 191, in flush o.flush() File "/usr/lib64/calibre/calibre/utils/logging.py", line 53, in flush self.stream.flush() BrokenPipeError: [Errno 32] Datenübergabe unterbrochen (broken pipe) If logging fails because somebody closed the output pipe, this is not an error. Let's just ignore this this silently. I removed the two .flush() implementations because those two classes inherit from Stream.
calibre

calibre is an e-book manager. It can view, convert, edit and catalog e-books in all of the major e-book formats. It can also talk to e-book reader devices. It can go out to the internet and fetch metadata for your books. It can download newspapers and convert them into e-books for convenient reading. It is cross platform, running on Linux, Windows and macOS.
For more information, see the calibre About page.
Screenshots
Usage
See the User Manual.
Development
Setting up a development environment for calibre.
A tarball of the source code for the current calibre release.
Bugs
Bug reports and feature requests should be made in the calibre bug tracker at launchpad. GitHub is only used for code hosting and pull requests.
Support calibre
calibre is a result of the efforts of many volunteers from all over the world. If you find it useful, please consider contributing to support its development. Donate to support calibre development.
Building calibre binaries
See Build instructions for instructions on how to build the calibre binaries and installers for all the platforms calibre supports.