On 31 January 2018 at 08:21, Dimitris Theodoropoulos <dimitris.theo.gr at gmail.com> wrote: OK, so it looks like it might be looking for a PseudoColor display, which I'm not sure is supported by current X11 (*), check if your MacOS server is supporting PseudoColor - I think Apple dropped it around a decade or so ago. You *might* be able to run Xephyr to present a sub XServer which can run 8 bit PseudoColor (its freely available under (*nix), not sure about Windows. (*) Current X11 on x86 looks to have dropped PseudoColor, though there may be some odd VESA or other target drivers. Current X11 on non x86 hardware still supports 8bit, 4bit and other crazy historical bitdepths, which is awesome in its own right, but probably not directly useful in this context. So if it is PseudoColor and your target display is Windows, some increasingly crazy options: Native Windows X servers - Look for a Windows Xephyr port and run under MobaXterm or similar - Find a really ancient (read, probably crashes a lot and may not work on recent Windows) Windows X server which support PseudoColor - Fire up a Linux VM and run Xephyr in there with the display set to MobaXterm Run your actual other OS image on a really fast PC in an emulator which simulates the actual display hardware it needs Using some other OS in a VM full screen as an X server - Check to see if there is some way to get the Linux VM to use a VESA or some other driver which comes in 8 bit - Fire up an ancient Linux (or similar) with X11 PseudoColor support in a VM - Fire up a modern (or even older) *nix for hardware which is native 8 or 4 bpp in qemu (I said increasingly crazy)