To completely remove PostgreSQL and its data from your Ubuntu system, follow these steps:
1. Stop the PostgreSQL Service: Ensure that the PostgreSQL service is stopped:
sudo systemctl stop postgresql
2. Uninstall PostgreSQL Packages: Remove all PostgreSQL packages from your system:
sudo apt-get --purge remove postgresql postgresql-*
3. Delete PostgreSQL Data and Configuration Files: Delete the PostgreSQL data directory and configuration files:
sudo rm -rf /etc/postgresql /var/lib/postgresql /var/log/postgresql
4. Remove PostgreSQL User and Group (Optional): If you no longer need the PostgreSQL user and group, you can remove them:
sudo deluser postgres
sudo delgroup postgres
5. Update the Package Database: Update the package database to ensure that all changes are recognized by the system:
sudo apt-get update
6. Remove Unused Dependencies: Clean up any unused dependencies:
sudo apt-get autoremove
sudo apt-get autoclean
7. Verify Removal: Confirm that PostgreSQL has been completely removed:
dpkg -l | grep postgresql
By following these steps, you should be able to completely remove PostgreSQL and its associated data from your Ubuntu system. If you encounter any issues or need further assistance, feel free to ask!