BUG #17381: psql: error: connection to server on socket "/var/run/postgresql/.s.PGSQL.5432" After installing

On 25. Jan 2022, at 4.28, PG Bug reporting form <noreply@postgresql.org> wrote:

The following bug has been logged on the website:

Bug reference: 17381
Logged by: Pratik Poudel
Email address: poudelpratik97@gmail.com
PostgreSQL version: 14.0
Operating system: Linux- Ubuntu
Description:

Hello,
I tried to install postgresql on Ubuntu 20 LTS.
I followed digital oceans docs and used the following for the
installation::
sudo apt-get update
sudo apt-get install postgresql postgresql-contrib

This installed successfully when I tried to switch to postgres account
using
sudo su - postgres
The above worked.
But it throws the error when i try the command "psql"

psql: error: connection to server on socket
"/var/run/postgresql/.s.PGSQL.5432"
failed: No such file or directory
Is the server running locally and accepting connections on that socket?

Hello!

I don't think Ubuntu starts the PostgreSQL server with those commands. You should set up and then start PostgreSQL e.g. with command systemctl start.

Best regards, Matti Linnanvuori