Thanks Daniel for working on this!

I've tried the silo in zesty, and I still cannot get past a black
screen. In the unity8 log I have:

==================
[2016-11-15:09:37:52.997] qtmir.screens: ScreensModel::ScreensModel
[2016-11-15:09:37:53.026] qtmir.mir: MirServer created
[2016-11-15:09:37:53.026] qtmir.mir: Command line arguments passed to Qt: 
("unity8", "--mode=full-shell")
[2016-11-15 09:37:53.390037] mirserver: Starting
ERROR: 
/build/mir-FMihxs/mir-0.24.1+16.10.20160928/src/server/graphics/default_configuration.cpp(132):
 Throw in function 
mir::DefaultServerConfiguration::the_graphics_platform()::<lambda()>
Dynamic exception type: 
boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::runtime_error>
 >
std::exception::what: Exception while creating graphics platform
ERROR: 
/build/mir-FMihxs/mir-0.24.1+16.10.20160928/src/common/sharedlibrary/shared_library.cpp(65):
 Throw in function void* mir::SharedLibrary::load_symbol(const char*, const 
char*) const
Dynamic exception type: 
boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::runtime_error>
 >
std::exception::what: 
/usr/lib/x86_64-linux-gnu/mir/server-platform/graphics-mesa-kms.so.11: 
undefined symbol: create_guest_platform, version MIR_GRAPHICS_PLATFORM_0.24


[2016-11-15:09:38:03.390] ERROR: QMirServer - Mir failed to start
initctl: No such variable: UNITY_MIR_SOCKET
==================

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https://bugs.launchpad.net/bugs/1584894

Title:
  unity-system-compositor (or any Mir server) crashes on start-up with
  "Mir fatal error: Failed to schedule page flip" on VirtualBox Graphics
  Adapter and QEMU

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