If the saying "to learn you have to make mistakes", I'm "learning"...:

I removed a cluster's folder without using pg_dropcluster... sio now I have
a corrupted cluster. How can I safely remove it?

(base) marco@pc:~$ pg_lsclusters
Ver Cluster Port Status Owner     Data directory                 Log file
11  fabmnet 5433 down   <unknown> /var/lib/postgresql/11/fabmnet
/var/log/postgresql/postgresql-11-fabmnet.log
11  main    5432 online postgres  /var/lib/postgresql/11/main
 /var/log/postgresql/postgresql-11-main.log

(base) marco@pc:~$ pg_dropcluster 11 fabmnet
Warning: corrupted cluster: data directory does not exist
Warning: systemd was not informed about the removed cluster yet. Operations
like "service postgresql start" might fail. To fix, run:
  sudo systemctl daemon-reload
(base) marco@pc:~$ sudo systemctl daemon-reload
[sudo] password for marco:
(base) marco@pc:~$ pg_dropcluster 11 fabmnet
Warning: corrupted cluster: data directory does not exist
Warning: systemd was not informed about the removed cluster yet. Operations
like "service postgresql start" might fail. To fix, run:
  sudo systemctl daemon-reload

Marco

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