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[Robert Ancell <robert.ancell@xxxxxxxxxxxxx>]

** Changed in: lightdm/1.18
       Status: Fix Committed => Fix Released

** Changed in: lightdm (Ubuntu Xenial)
       Status: Triaged => Fix Committed

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https://bugs.launchpad.net/bugs/1583624

Title:
  Mir cannot open a tty when started by lightdm

Status in Light Display Manager:
  Fix Released
Status in Light Display Manager 1.18 series:
  Fix Released
Status in lightdm package in Ubuntu:
  Fix Released
Status in lightdm source package in Xenial:
  Fix Committed

Bug description:
  From mir-greeter.log (and with minor instrumentation from RAOF)

  ERROR: QMirServer - Mir failed to start
  qtmir.screens: ScreenController::ScreenController
  qtmir.mir: MirServer created
  qtmir.mir: Command line arguments passed to Qt: ("/usr/bin/unity8", "--mode=greeter")
  ERROR: /home/josh/Documents/mir/verbose-error-for-vt-finding/src/server/graphics/default_configuration.cpp(133): 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: /home/josh/Documents/mir/verbose-error-for-vt-finding/src/platforms/mesa/server/kms/linux_virtual_terminal.cpp(238): Throw in function int mir::graphics::mesa::LinuxVirtualTerminal::find_active_vt_number()
  Dynamic exception type: boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::runtime_error> >
  std::exception::what: Failed to find the current VT. Tried:
  	/dev/tty0:
  		Failed to open read-only: Permission denied
  		Failed to open write-only: Permission denied
  	/dev/tty:
  		Failed to open read-only: No such device or address
  		Failed to open write-only: No such device or address

  
  This occurs when trying to start the unity8 greeter under unity system compositor

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