psql -U postgres

$ sudo -u postgres psql

​

Then type

​

# ALTER USER my_user_name with password 'my_secure_password';

# sudo -u postgres psql

could not change directory to "/root"

psql (9.1.11)

Type "help" for help.

​

postgres=# \password

Enter new password:

Enter it again:

postgres=# \q

​

What I did to resolve the same problem was:

​

Open pg_hba.conf file with gedit editor from the terminal:

​

sudo gedit /etc/postgresql/9.5/main/pg_hba.conf

It will ask for password. Enter your admin login password. This will open gedit with the file. Paste the following line:

​

host  all   all  127.0.0.1/32  trust

just below -

​

# Database administrative login by Unix domain socket

Save and close it. Close the terminal and open it again and run this command:

​

psql -U postgres

You will now enter the psql console. Now change the password by entering this:

​

ALTER USER [your prefered user name] with password '[desired password]';

If it says user does not exist then instead of ALTER use CREATE.

​

Lastly, remove that certain line you pasted in pg_hba and save it.

​

​

In command prompt:

> psql -U postgres(postgres is my username)

> <Type in your current password>

> \password postgres

In any PostgreSQL Query editor just type this

​

ALTER USER postgres WITH PASSWORD 'new_password';

Backup the pg_hba.conf file by copying it.

Edit the pg_dba.conf, change `METHOD` to 'trust'

Restart the PostgreSQL server.

psql -U postgres.

ALTER USER postgres WITH PASSWORD 'new_password';

Restore the pg_dba.conf file.

Restart the PostgreSQL server.

psql -U postgres

# if you are getting this auth error then

# please check if psql is using the password for correct user

# for ex, if you are trying to enter as the default user, which

# is 'postgres' then type this

​

psql -U postgres

​

# you will be promted for password,enter it

sudo sed -ibak 's/^\([^#]*\)md5/\1trust/g' /opt/bitnami/postgresql/conf/pg_hba.conf

sudo -u postgres pg_ctl reload

​

pg_ctl -D "C:\Program Files\PostgreSQL\12\data" restart

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