Believe it or not -this story wasn't over. See,
https://www.mobileread.com/forums/sh...d.php?t=291110
After all this time, suddenly I can now add books to Calibre when I launch Calibre from firejail. I do not know if it's because of the new version 4+ or all the new upgrades from KDE in the last couple of weeks / month. Anyway, I can now add books when Calibre is launched from firejail.
Now however, I cannot use book Viewer when Calibre is launched from firejail. When I double click on a book, nothing happens.
Clicking on the
View icon or choosing
View with calibre e-book viewer. Nothing happens not even an error pop up box.
As well,
Edit book doesn't work either.
Everything works fine when Calibre is launched outside of firejail though