Software & AppsOperating SystemLinux

How To Uninstall PostgreSQL on Ubuntu

Ubuntu 10

In this article, we will guide you through the process of uninstalling PostgreSQL on Ubuntu. PostgreSQL is a powerful, open-source object-relational database system. However, there may be instances where you need to remove it from your system. Let’s dive into the different methods you can use to uninstall PostgreSQL.

Quick Answer

To uninstall PostgreSQL on Ubuntu, you can use the apt-get command with the –purge option to remove the package and its configuration files. Additionally, you can delete the PostgreSQL folders manually or use the dpkg command to remove all PostgreSQL-related packages.

Method 1: Using apt-get command

The apt-get command is a powerful command-line tool, which works with Ubuntu’s Advanced Packaging Tool (APT) performing such functions as installation of new software packages, upgrade of existing software packages, updating of the package list index, and even upgrading the entire Ubuntu system.

Here is how you can use it to uninstall PostgreSQL:

  1. Open a terminal.
  2. Type the command: sudo apt-get --purge remove postgresql. The --purge option tells apt to remove not just the package but also the configuration files. This command will remove the PostgreSQL package from your system. However, there may be additional packages installed that are related to PostgreSQL.
  3. To search for and remove any additional packages, type the command: dpkg -l | grep postgres. The dpkg -l command lists all packages, and grep postgres filters for postgres related packages. You can then use the command sudo apt-get --purge remove {package name} to remove each package individually.

Method 2: Deleting the PostgreSQL folders

This method involves manually deleting the PostgreSQL folders. Here are the steps:

  1. Open a terminal.
  2. Stop the PostgreSQL services by running the command: sudo service postgresql stop. The service command is used to run system wide services. In this case, it stops the PostgreSQL service.
  3. Double-check the installed versions of PostgreSQL by running the command: dpkg -l | grep postgres.
  4. Use the following command to remove all dependencies. Replace postgresql-12 and postgresql-client-12 with the appropriate version numbers:
sudo apt-get --purge remove postgresql-12 postgresql-client-12 postgresql-client-common postgresql-common

This command will remove the PostgreSQL server, client, and common files.

Method 3: Using dpkg command

The dpkg command is a tool to install, build, remove and manage Debian packages. Here is how you can use it to uninstall PostgreSQL:

  1. Open a terminal.
  2. Stop the PostgreSQL services by running the command: sudo service postgresql stop.
  3. Double-check the installed versions of PostgreSQL by running the command: dpkg-query -W postgres*. The dpkg-query -W command shows the version of the installed package.
  4. Use the following command to purge all PostgreSQL-related packages:
sudo dpkg --purge $(dpkg-query -f '${Package} ' -W postgres*)

The dpkg --purge command removes everything related to the packages, including configuration files.

Please note that these methods assume you have installed PostgreSQL using the package manager (apt-get). If you have installed it using a different method, the commands may vary.

We hope this guide has been helpful in explaining how to uninstall PostgreSQL from your Ubuntu system. If you have any questions or run into any issues, please leave a comment below, and we’ll do our best to assist you.

Can I uninstall PostgreSQL without removing the data and databases?

Yes, the uninstallation process described in the methods above will remove PostgreSQL and its configuration files. However, it will not remove the data and databases stored in PostgreSQL. If you want to remove the data and databases as well, you can manually delete the PostgreSQL data directory which is typically located at /var/lib/postgresql/.

Will uninstalling PostgreSQL affect other applications or services?

Uninstalling PostgreSQL should not affect other applications or services unless they are dependent on PostgreSQL. However, it is always a good idea to check for any dependencies before uninstalling PostgreSQL. You can use the dpkg -l | grep postgres command to list any additional packages related to PostgreSQL and remove them individually if needed.

Can I reinstall PostgreSQL after uninstalling it?

Yes, you can reinstall PostgreSQL after uninstalling it. You can use the same methods to reinstall PostgreSQL as you would for any other package on Ubuntu. Simply use the appropriate installation command, such as sudo apt-get install postgresql, to reinstall PostgreSQL.

Will uninstalling PostgreSQL remove any custom configurations I have made?

Yes, the --purge option used in the uninstallation commands will remove all configuration files related to PostgreSQL. This includes any custom configurations you have made. If you want to keep your custom configurations, make sure to backup the configuration files before uninstalling PostgreSQL.

Can I use these methods to uninstall a specific version of PostgreSQL?

Yes, you can use these methods to uninstall a specific version of PostgreSQL. Simply replace the version number in the commands with the version you want to uninstall. For example, if you want to uninstall PostgreSQL 13, you would use postgresql-13 instead of postgresql-12 in the commands provided.

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