Influx Installation from Openhabian Fails

Hello Guys.
When trying to install InfluxDB from Openhabian i get a fault, when it tries to apt-get update - the fault is generated when it tries to update " groovy release - and is therefore disabled by default.
Running Ubuntu 20

E: The repository ‘ groovy Release’ does not have a Release file.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

I managed to get tin InfluxDB installed another way around, but then when OH tries to connect it says the DB is not prepared…

How to make this work?

Either have a look at the content of openhabian-config and do all the steps that are being executed in case of the influx setup via openhabian or have a look to this tutorial - assumed it still works - InfluxDB+Grafana persistence and graphing