postgres@student:/home/student$ psql
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"?
postgres@student:/home/student$ uname -a
Linux student 4.10.0-37-generic #41~16.04.1-Ubuntu SMP Fri Oct 6 22:42:22 UTC 2017 i686 i686 i686 GNU/Linux