Sigil is one I've used to good effect for simple edits to epubs:
in Debian 12 at least, one can 'apt get install sigil' to get it
this post was submitted on 23 Feb 2025
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Calibre is the answer to pretty much all ebook questions, including this one.
Change the file type to zip...unzip it then work on the pdf and rename it..?
Unzip and text editor?
Calibre is the ultimate e-book manager/reader/editor. apt install calibre and you're set.
Calibre is better installed by its own method as outlined on its site. Any apt repositories are unofficial and likely to be behind current.
Sigil https://sigil-ebook.com/
This is in fact a professional editor. If OP is looking into getting balls deep into ebook editing, this is the answer.
Usually you write the book with a text formatter and package the results in to an epub, so IDK if it's common to edit the epub directly.
The epub is just a zip file containing a metadata file and a bunch of simplified HTML files (one per chapter). So if you're comfortable editing HTML, or better yet writing scripts, you can probably slap together something simple that unpacks the epub, strips those images out of the pages, and re-packages the epub.