login to postgresql

In order to log in to Postge SQL I have to switch to user postgres first. qqpulsa777 login (base) irbis@irbis-System-Product-Name:~$ sudo su - postgres [sudo] password for irbis: postgres@irbis-System-Product-Name:~$ psql psql (13. qqpulsa777 login 8 (Ubuntu 13 8-1 pgdg20 04+1)) Type "help" for help postgres=# Without switching to postgres there is an error: (base) irbis@irbis