I installed jitsi and jibri on ubuntu 18 but
/etc/jitsi/jibri/config.json is replaced by jibri.conf
Where can I find how to configure jibri.conf and what files more is needed to configure
Here is a migration guide - https://github.com/jitsi/jibri/blob/master/doc/config_migration_guide.md
There you’ll find notes for migrating all the configuration options from the old file to the new. If you cahe a backup copy of the old file, you can still use it. The old file will still work, but you’ll want to migrate, because in future the old format support will be eventually dropped.
And here is an example for the new environments config, with more comments inline - https://github.com/jitsi/jibri/blob/master/doc/example_xmpp_envs.conf