Once you've installed Ubuntu with security in mind and reduced the possibility of network attacks on your system, you can start thinking about security on an application level. In the event that a malicious file is opened on your system, will an attacker be able to access every file on the computer? The chances are much slimmer if you put the proper defenses in place.
In this third part to our mini-series on strengthening your primary Ubuntu installation, you'll learn how Ubuntu package repositories work, which repos you should avoid, and how to update. Also, you'll see how to import additional AppArmor profiles to limit resources that apps can use, as well as create sandboxes to completely isolate unsafe applications from the operating system.
If you missed the beginning of this article series, you should check out the first part to learn more about my motivations for starting this four-part guide.
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Step 1: Install the Lastest System Updates
Part of keeping your system secured is simply ensuring the latest package and application updates are installed.
If you're coming from Windows 10, you'll be used to downloading and installing new applications from random websites. This practice is inherently unsafe. Unsigned, unverified applications distributed by one source creates the potential for supply chain attacks.
Linux handles installing software differently. Ubuntu uses several repositories (servers) that contain packages (software and dependencies) audited by Canonical, Ubuntu developers, and the security team. Not all of the Ubuntu's repositories ..
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