The "Permission denied" error suggests the apparmor profile, or whatever
else lightdm is doing special to the guest session, is the reason for
this failure.
Can you check in syslog if you have a DENIED message from apparmor?
** Also affects: lightdm (Ubuntu)
Importance: Undecided
Status: New
** Changed in: unity8 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1644237
Title:
unity8 fails to start as guest user
Status in lightdm package in Ubuntu:
New
Status in unity8 package in Ubuntu:
Incomplete
Status in unity8-desktop-session package in Ubuntu:
New
Bug description:
This is shown in unity8.log:
[2016-11-23 15:59:25.820868] mirserver: Starting
ERROR:
/build/mir-JY573_/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-JY573_/mir-0.24.1+16.10.20160928/src/server/graphics/nested/mir_client_host_connection.cpp(245):
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: Permission denied
[2016-11-23:15:59:35.820] ERROR: QMirServer - Mir failed to start
initctl: No such variable: UNITY_MIR_SOCKET
running current zesty, but I had the same problem on yakkety too.
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