Error: Assertion failed for PostgreSQL Cluster

If you ever encounter this error message

Assertion failed for PostgreSQL Cluster cluster-name

or

Assertion failed on job for postgresql@11-cluster-name.service

after creating a cluster of the name "cluster-name" it might be because somewhere the hyphen is considered invalid. Just

pg_dropcluster <version> cluster-name
pg_createcluster <version> clustername

to drop and re-create the cluster without hyphen.

I created this blog entry because I could not find any reference to this specific error with this specific reason. It might be some Debian specific error as PostgreSQLs initdb command is wrapped by pg_createcluster which again isn't mentioned by PostgreSQL. Searching the web shows mostly results in context of Ubuntu and Debian.