How To Install Sigil 2.4 on Ubuntu 24.10, Ubuntu 24.04, Ubuntu 22.04, Linux Mint And Derivative Systems (via Flatpak)

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As you may know, Sigil is a free, open-source, cross-platform EPUB editor, allowing the users to easily create and edit EPUB files. It is popular among writers, publishers and digital content creators that need to create high-quality EPUB files.

Among others, it has a user-friendly GUI, combining WYSIWYG (What You See Is What You Get) editing with code editing, it includes tools to validate EPUB files, has support for the EPUB 2 and EPUB 3 formats, it has a built-in metadata editor used for enhancing titles, authors and publication dates, it enables users to generate table of contents quick and has spell check and grammar tools and split and merge features included.

Also, Sigil is capable of working with EPUB files created with other tools.

The latest version available:

The latest version available is Sigil 2.4, which comes with the below changes:

New Features

added a GetInfo dialog and right click menu option for XHTML files that provides a collection of information specific to that file without having to run Reports (including a word count)
added support for multiple semantics per xhtml file, while uncommon is technically allowed by the spec
made debugging with VS IDE easier
improve Sigil Well-Formed (sanity check) to better identify errors with missing attribute quotes
update to Qt 6.7.3 and its PySide6 version for MacOS and Windows release builds
updates to building on linux documentation
add support for building with and using virtual python environments on Windows and Linux
change Replacement Chooser to use Checkboxes to determine if replacements should be made, no deletes

And various bug-fixes. More information is available via the changelog.