Install PostgreSQL on a Linux-based operating system.

You can follow these steps:

1. Update the package manager:

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sudo apt update

2. Install PostgreSQL:

sudo apt install postgresql postgresql-contrib

3. Once the installation is complete, you can check the status of the PostgreSQL service:

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sudo systemctl status postgresql

4. If the service is not running, you can start it with the following command:

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sudo systemctl start postgresql

5. By default, PostgreSQL creates a user named "postgres". To create a new user, you can use the following command:

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sudo -u postgres createuser --interactive

6. To create a new database, you can use the following command:

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sudo -u postgres createdb [database name]

That's it! You have successfully installed PostgreSQL on your Linux-based system.