Quote:
Originally Posted by sewi_rafal
I use debian unstable package: 4.99.4+dfsg+really4.10.0+py3-2
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Probably a bug related to Python 3. Have you tried the official Linux release?
https://calibre-ebook.com/download_linux
Added: I tested your HTML file with the calibre 4.99.4 beta (Python 3) under Windows and it fails there. So it does appear to be related to calibre's Python 3 porrting.