Pop!_OS
Pop!_OS is an Ubuntu-based Linux distribution featuring its own GNOME-based desktop environment called COSMIC. It is designed with productivity in mind; it has fluid windows, search navigation via the Super key, workspaces that can hide clutter, and efficient auto-tiling of windows.
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Vanilla OS
Vanilla OS, a fixed-release distribution based on Debian (formerly Ubuntu, prior to version 2) with the GNOME desktop, is an immutable operating system. The core parts of the system are locked down to prevent unwanted changes and corruption from third-party applications or a faulty update.