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Personal Package Archives (PPA) are repositories designed to distribute software and updates that are not available in the official Ubuntu repositories. While PPAs are incredibly useful for getting the latest software versions, they can pose security risks if not managed correctly. In this blog post, we’ll guide you through how to securely add custom PPAs to your Ubuntu system, focusing on best practices and also touching upon other package managers like dnf and zypper briefly. PPAs allow users and developers to upload Ubuntu source packages to be built and published as an apt repository by Launchpad.