Fedora Silverblue # Fedora Silverblue 1 is an immutable desktop operating system based on Fedora Linux distribution. What immutable does mean is that most directories including rootfs (/) are mounted as read-only, and user applications run in an isolated execution environment. It is a part of Atomic Host project, and share the same underlying system with Fedora CoreOS (FCOS). For this purpose, Fedora Silverblue adopted two technologies: