$ example-printing 
Loading module: 'libubuntu_application_api_desktop_mirclient.so.3.0.0'
[QPA] QMirClientClientIntegration: connection to Mir server failed.

Mir returned: "Failed to connect: not accepted by server"
[2017-03-16 17:08:08.315424] <ERROR> MirConnectionAPI: Caught exception at client library boundary (in mir_connection_release): /build/mir-rgB9wX/mir-0.26.1+17.04.20170209.1/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
[boost::errinfo_errno_*] = 32, "Broken pipe"