How can new software packages be installed in Debian?

You can install new software packages in Debian by using the apt package management tool. Here are the steps for installing a new software package:

1. Open the terminal and type the following command to update the package list and software package information: sudo apt update.
2. Next, enter the following command to install the specified software package, for example to install the Firefox browser: sudo apt install firefox.
3. The system will prompt you to confirm the installation of the software package, press ‘y’ and then press the Enter key to confirm.
4. Wait for the software package to finish downloading and installing.
5. After installation is complete, you can find and open the newly installed software package in the application menu.

Please make sure you have sufficient permissions to install new software packages, and use the sudo command to elevate permissions if needed.