installed PostgreSQL on Linux. The problem is that I can’t use the PSQL command, because requires a password. When installing, it seems the password did not need. I tried to enter the password from the server, did not work.
Tried to remove PostgreSQL from the server, did not work because requires a password.

What could be the problem?

Answer 1, Authority 100%

1. in the file pg_hba.conf change the authentication method on trust
2. Restart postgreSQL

service

3. Run PSQL and execute alter user postgres password 'newpass';
4. Return the previous authentication methods in the pg_hba.conf file
5. Restart postgreSQL

again

Answer 2, Authority 50%

There are two options:

1. logged under the “administrator”:

   Sudo -u Postgres PSQL Postgres

   will ask the password from the current user.

2. Create a new user and database:

   sudo -u postgres CreateUser -L name
   sudo -u postgres crasedb -o name_name_Base name
   PSQL_name_Base
   

   will ask the password from the current user.

   Name – the name of the current user in the system.

If it says that the password is not correct:

su root

User Password Root Servers.

su postgres

And then one of the examples is higher, only without sudo -u postgres .