Forums PostgreSQL.fr

Je viens d'installer pg 10 sur Debian 9.4. J'essaye de démarrer pg, mais ça ne marche pas.
Voici le résultat de pg_ctl start:

postgres@POSTGRES:~$ /usr/lib/postgresql/10/bin/pg_ctl start -D /usr/local/pgsql/data
waiting for server to start....2018-05-16 17:47:42.287 CEST [4654] LOG:  could not bind IPv6 address "::1": Address already in use
2018-05-16 17:47:42.287 CEST [4654] HINT:  Is another postmaster already running on port 5432? If not, wait a few seconds and retry.
2018-05-16 17:47:42.287 CEST [4654] LOG:  could not bind IPv4 address "127.0.0.1": Address already in use
2018-05-16 17:47:42.287 CEST [4654] HINT:  Is another postmaster already running on port 5432? If not, wait a few seconds and retry.
2018-05-16 17:47:42.287 CEST [4654] WARNING:  could not create listen socket for "localhost"
2018-05-16 17:47:42.287 CEST [4654] FATAL:  could not create any TCP/IP sockets
2018-05-16 17:47:42.287 CEST [4654] LOG:  database system is shut down
stopped waiting
pg_ctl: could not start server
Examine the log output.

Pourtant j'arrive localement à me connecter avec psql. Je peux faire createdb, par exemple, sans problème.
Qu'est-ce qui cloche?
Merci !