问更新Xubuntu Xubuntu，Postgres停止工作

EN

postgresql.service - PostgreSQL RDBMS
   Loaded: loaded (/lib/systemd/system/postgresql.service; enabled; vendor prese
   Active: active (exited) since Mon 2019-12-09 07:33:43 EST; 4h 30min ago
 Main PID: 1217 (code=exited, status=0/SUCCESS)
    Tasks: 0 (limit: 4915)
   Memory: 0B
   CGroup: /system.slice/postgresql.service

Dec 09 07:33:43 alexmerced-X550EA systemd[1]: Starting PostgreSQL RDBMS...
Dec 09 07:33:43 alexmerced-X550EA systemd[1]: Started PostgreSQL RDBMS.
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ii  postgresql                            11+204ubuntu0.1                        all          object-relational SQL database (supported version)
ii  postgresql-11                         11.5-1                                 amd64        object-relational SQL database, version 11 server
ii  postgresql-client-11                  11.5-1                                 amd64        front-end programs for PostgreSQL 11
ii  postgresql-client-common              204ubuntu0.1                           all          manager for multiple PostgreSQL client versions
ii  postgresql-common                     204ubuntu0.1                           all          PostgreSQL database-cluster manager

pg_lsclusters
Ver Cluster Port Status Owner    Data directory              Log file
11  main    5432 down   postgres /var/lib/postgresql/11/main /var/log/postgresql/postgresql-11-main.log

psql -h /tmp
psql: could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/tmp/.s.PGSQL.5432"?

sudo service postgres restart
Failed to restart postgres.service: Unit postgres.service not found.

ps aux |grep postgres
alexmer+ 26272  0.0  0.0   9028   916 pts/2    S+   12:11   0:00 grep --color=auto postgres