Comment 27 for bug 1898904

I have installed the calibre 4.99.4+dfsg+really4.12.0-1ubuntu1 package version from the proposed archive in Kubuntu 20.04. Calibre starts successfully. However, please note that I previously had patched the 4.99.4+dfsg+really4.12.0-1build1 version as suggested in #9, so it was starting anyway in my system.
No conflict was given on apt install of the new version though, perhaps the patch being applied is exactly the same as that in #9?