[jakubsafar]

Originally Posted by kovidgoyal

Yup the issue is this one:
https://projects.blender.org/blender.../issues/114452

And the workaround is to set

OPENSSL_CONF=/dev/null

Thank you, works like charm.

#!/bin/bash

OPENSSL_CONF=/dev/null 
export OPENSSL_CONF
echo "The OPENSSL_CONF variable is now set to" $OPENSSL_CONF "."

/usr/bin/calibre

unset OPENSSL_CONF
echo "The OPENSSL_CONF is now unset."