$ 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
In command prompt:
> psql -U postgres(postgres is my username)
> <Type in your current password>
> password postgres
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.
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.
sudo sed -ibak 's/^([^#]*)md5/1trust/g' /opt/bitnami/postgresql/conf/pg_hba.conf
sudo -u postgres pg_ctl reload
psql -U postgres
pg_ctl -D "C:Program FilesPostgreSQL12data" restart
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