pgadmin3 can be installed using following command
sudo apt-get install pgadmin3
You can invoke pgadmin3 GUI from main menu as well as by typing following command.
From file menu, please use ‘add server’ and enter data as below:
If you facing authentication issue, please use following commands to reset the password.
$sudo -u postgres psql postgres psql (9.6.3) Type "help" for help. postgres=# password postgres Enter new password: Enter it again: