Learning how to use the terminal in Linux is essential, especially if you need to install apps that are not in your software center. A good tutorial can be found here.
Here’s a tutorial on how to install apps in a Linux terminal.

To install the GUFW firewall in terminal, use the following:
sudo apt-get install gufw
After install, read more on how to configure here.


To install Gimp image editor, use the following in terminal:
sudo apt-get install gimp
*Note: Gimp is available in most software centers.


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