The article provides a comprehensive guide on creating and distributing Debian packages through an apt repository, focusing on Ubuntu users. It begins with the creation of a simple "Hello World" program in C, which is then packaged into a .deb file, emphasizing the importance of naming conventions for directories. The tutorial further explains setting up an apt repository, generating Packages and Release files, and compressing data for efficient distribution. It highlights the security aspect by detailing the process of signing the repository with a PGP key, ensuring package integrity and authenticity. The article also covers the importance of securing private keys, offers a complete example using Earthly for a streamlined process, and provides a practical approach to testing the repository setup. The guide is aimed at developers seeking to distribute software securely via apt and includes practical coding examples and security considerations.