Ubuntu 16.04 Unity8 black screen

[dinamic]

just installed a fresh 16.04 daily build, updated and installed unity8 desktop session mir.

expected: unity8
actual result: black screen

[dinamic (dinamic6661)]

mir-0.17.1+16.04.20151105.1/src/client/rpc/stream_socket_transport.cpp(168): Throw in function virtual void mir::client::rpc::StreamSocketTransport::send_message(const std::vector<unsigned char>&, const std::vector<mir::Fd>&)
Dynamic exception type: boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<mir::socket_disconnected_error> >
std::exception::what: Failed to send message to server: Broken pipe
32, "Broken pipe

[dinamic (dinamic6661)]

Failed to connect to Mir: Failed to connect: not accepted by server
[1450528330.893660] <ERROR> MirConnectionAPI: Caught exception at client library boundary (in release): /build/mir-sTjxjQ/mir-0.17.1+16.04.20151105.1/src/client/rpc/stream_socket_transport.cpp(168): Throw in function virtual void mir::client::rpc::StreamSocketTransport::send_message(const std::vector<unsigned char>&, const std::vector<mir::Fd>&)
Dynamic exception type: boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<mir::socket_disconnected_error> >
std::exception::what: Failed to send message to server: Broken pipe
32, "Broken pipe"
Unable to init server: Could not connect: Connection refused

(gst-plugin-scanner:2013): Clutter-CRITICAL **: Unable to initialize Clutter: Could not initialize Gdk

(gst-plugin-scanner:2013): Clutter-Gst-CRITICAL **: Unable to initialize Clutter
()
qtmir.screens: ScreenController::ScreenController
[1450528331.562308] mirplatform: Found graphics driver: mesa-kms
[1450528331.562423] mirplatform: Found graphics driver: mesa-x11
qtmir.mir: MirServer created
[1450528331.564144] mirserver: Starting
[1450528331.564389] mircommon: Loading modules from: /usr/lib/x86_64-linux-gnu/mir/server-platform
[1450528331.564498] mircommon: Loading module: /usr/lib/x86_64-linux-gnu/mir/server-platform/graphics-mesa-kms.so.6
[1450528331.564563] mircommon: Loading module: /usr/lib/x86_64-linux-gnu/mir/server-platform/server-mesa-x11.so.6
[1450528331.565985] mirplatform: Found graphics driver: mesa-kms
[1450528331.566061] mirplatform: Found graphics driver: mesa-x11
[1450528331.566183] mirserver: Selected driver: mesa-kms (version 0.17.1)
ERROR: /build/mir-sTjxjQ/mir-0.17.1+16.04.20151105.1/src/server/graphics/nested/mir_client_host_connection.cpp(192): Throw in function mir::graphics::nested::MirClientHostConnection::MirClientHostConnection(const string&, const string&, const std::shared_ptr<mir::shell::HostLifecycleEventListener>&)
Dynamic exception type: boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::runtime_error> >
std::exception::what: Nested Mir Platform Connection Error: Failed to connect to server socket: No such file or directory

ERROR: QMirServer - Mir failed to start

[Albert Astals Cid (aacid)]

Can you try if running gst-inspect-1.0 under any X11 session (unity7, plasma, xfce) fixes the problem?

[dinamic (dinamic6661)]

i am no longer affected by this bug (update/upgrade ... something fixed it :o)

[Alexander Langanke (alexlanganke)]

I have this problem right now.
System boots to the standard lightdm greeter, I choose Unity8, screens goes black and stays that way.

[Dirk Mcbratney (djmcbratney)]

Same here. No mouse pointer or anything, just a pure black screen the moment I hit Enter after typing my password.

[Martin Vysny (vyzivus)]

I have just tried the unity8 session. After entering the password, the screen went black and stayed black - no mouse, nothing. I am attaching the unity8 log.

[KuriKai (eunbolt-gmail)]

I also have this problem, how do i get the error log for this so i can post it?