PostgreSQL：无法连接到服务器：域套接字"/var/run/postgresql/.s.PGSQL.5432"

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Linux Mint. PostgreSQL 11.

我正在尝试：psql -U postgres

could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"
In postgresql.conf:
   listen_addresses = '*'
   unix_socket_directories = '/var/run/postgresql'
   unix_socket_permissions = 0777
经过ps axf | grep postgres。
6575 ?        Sl     0:01          |       |   \_ xed /etc/postgresql/11/main/postgresql.conf
4906 pts/0    S      0:00          \_ sudo su postgres
4907 pts/0    S      0:00              \_ su postgres
6586 pts/0    S+     0:00                                      \_ grep --color=auto postgres
  root@andrej-HP-290-G1-SFF-Business-PC:/etc/postgresql/11/main# netstat -nltp | grep 5432
  root@andrej-HP-290-G1-SFF-Business-PC:/etc/postgresql/11/main# 
我是如何尝试治疗这个问题的。
ln -s /tmp/.s.PGSQL.5432 /var/run/postgresql/.s.PGSQL.5432
sudo find /tmp/ -name .s.PGSQL.5432
结果。/tmp/.s.PGSQL.5432。   并在su下尝试：psql -U postgres
Running 'pg_lsclusters', I see:
11  main    5432 down   postgres /var/lib/postgresql/11/main /var/log/postgresql/postgresql-11-main.log
所以，状态是关闭的。但当我尝试 "pg_ctlcluster 11 main start "时，我收到了。
Job for postgresql@11-main.service failed because the service did not 
take the steps required by its unit configuration.
See "systemctl status postgresql@11-main.service" and "journalctl -xe" 
for details.
正在执行 "journalctl -xe"。
 failed to create Unix-сокет in "/tmp
 system bd is switched-off
 failde to start server
  Can't open PID file /run/postgresql/11-main.pid (yet?) after start: 
  No such file or dir
  Failed with result 'protocol'.