Explore the challenges and solutions surrounding the restriction of unprivileged user namespaces in Ubuntu 24.04 in this 47-minute conference talk by John Johansen and Maxime Bélair from Canonical. Gain insights into the retrospective analysis of the implementation process, including the obstacles encountered and the strategic decisions made by the Ubuntu team. Delve into the remaining issues and ongoing efforts to address them, providing a comprehensive overview of this significant security enhancement in the Ubuntu operating system.