This tutorial guides users through building and packaging a Flutter Linux desktop app using Bitrise, a CI/CD platform. To start, users need to build their application on the targeted platform, in this case, Linux. The required packages for Linux development include the Flutter SDK, clang, cmake, ninja-build, pkg-config, libgtk-3-dev, and liblzma-dev. Users can use the `flutter build linux` command to create a binary executable that includes required libraries and data assets. To deploy their app to Bitrise, users must log in to their account, connect their GitHub repository, and select the suitable stack for their application. The CI/CD workflow involves adding script steps to install prerequisites, enable Flutter desktop for Linux, run the `flutter build` command, copy the build folder to the deployment directory, and deploy the app to Bitrise.io. After a successful build, users can download the artifacts, unzip the folder, and open the app executable file on their Ubuntu machine.