error: connection to server on socket...

Using the following command on my Debian 12 machine:

/*sudo apt-get install postgresql postgresql-15 postgresql-client-common
postgresql-common postgresql-contrib postgresql-doc phppgadmin
*/

and following the instruction on this
<https://wiki.debian.org/PostgreSql#User_access> web page I have
installed PostgreSQL-15.
The installation went smooth, until the following command was issued :

/*sudo -u postgres psql*/

... I get an error message that reads:

/*could not change directory to "/home/my_account": Permission denied*//*
*//*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?*/

What can I do to resolve this issue?

Thanks in advance.