Yes. It's the same problem.
Either comment out the setting of QTLIB_DIR in Sigil's launch script (/usr/local/bin/sigil) as described here:
https://www.mobileread.com/forums/sh...73#post4373073
Or use my self-contained Python AppImage for Sigil's plugin interpreter that has all of Sigil's needs installed. Download sigil-qt6-python3.11_x86_64.AppImage from the asset list at
https://github.com/dougmassay/appima...ag/2023.11.2-1, save it somewhere you'll remember, mark it as executable and set it as the interpreter in Sigil's plugin preferences.
The 2nd solution will work after rebuilds/updates/reinstalls, but the first solution will need to be redone after every new rebuild/update/reinstall.
I really wish Debian/Ubuntu would commit to providing a PySide6 package in their repos like other distros are doing. It would make all of this unnecessary.