Only CLI software officially, we are adding GUI support ourselves next update. Technically other OSes like Windows 11 or better suitable Linux distributions can be run too but the feature currently only uses Debian.

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GUI support allows you to run desktop operating system apps on mobile. Docking the device to a keyboard and mouse and external display in the future would allow using your phone like a desktop PC. You get the benefit of running a desktop OS over a device with strong hardware security and a proper secure element unlike a desktop. Adding this GUI support is also a stage into working towards support for running Apps within GrapheneOS virtual machines for stronger sandboxing and isolation. Additional security.