In this post, I am sharing necessary steps to remove or uninstall PostgreSQL 9.6 from Ubuntu OS. Yesterday, I was testing a few latest extensions in my PostgreSQL test server, and unfortunately, PostgreSQL Server corrupted.

As this is my test server, so simply I uninstalled full setup and again installed it.

PostgreSQL: How to Install PostgreSQL 9.6 on Ubuntu 16.04?

Please check below commands which I applied to uninstalled PostgreSQL:

First check Postgres related folders:

ubuntu@ip:~/anvesh$ dpkg -l | grep postgres

Result:

ii  pgdg-keyring               2014.1                  all     keyring for apt.postgresql.org
ii  postgresql-9.6             9.6.1-2.pgdg14.04+1     amd64   object-relational SQL database, version 9.6 server
ii  postgresql-client-9.6      9.6.1-2.pgdg14.04+1     amd64   front-end programs for PostgreSQL 9.6
ii  postgresql-client-common   178.pgdg14.04+1         all     manager for multiple PostgreSQL client versions
ii  postgresql-common          178.pgdg14.04+1         all     PostgreSQL database-cluster manager
ii  postgresql-contrib-9.6     9.6.1-2.pgdg14.04+1     amd64   additional facilities for PostgreSQL

Command to remove few postgres folders:

ubuntu@ip:~/anvesh$ sudo apt-get --purge remove postgresql postgresql-doc

Now check again Postgres related folders:

ubuntu@ip:~/anvesh$ dpkg -l | grep postgres

Result:

ii  pgdg-keyring              2014.1                all    keyring for apt.postgresql.org
ii  postgresql-client-9.6     9.6.1-2.pgdg14.04+1   amd64  front-end programs for PostgreSQL 9.6
ii  postgresql-client-common  178.pgdg14.04+1       all    manager for multiple PostgreSQL client versions

Now remove all other pending folders:

ubuntu@ip:~/anvesh$ sudo apt-get --purge remove postgresql postgresql-client-9.6 postgresql-common pgdg-keyring

Now PostgreSQL is uninstalled so confirmt that PSQL is running or not:

ubuntu@ip:~/anvesh$ psql
The program 'psql' is currently not installed. You can install it by typing:
sudo apt install postgresql-client-common

Now check the Postgres service status:

ubuntu@ip:~/anvesh$ sudo service postgresql status
● postgresql.service
   Loaded: not-found (Reason: No such file or directory)
   Active: inactive (dead)