Hi there Thomas,
thanks for your detailed information so far. I also am unable to reproduce this 
myself. However from the stacktrace you supplied, I see the crash is happening 
during dbus traffic. I suspect these errors are vital:

[WARNING] Object::connect: No such signal 
QDBusAbstractInterface::activeChanged(bool) in 
/build/buildd/unity-2d-5.10.0/libunity-2d-private/src/dashclient.cpp:72
[WARNING] Object::connect: No such signal 
QDBusAbstractInterface::alwaysFullScreenChanged(bool) in 
/build/buildd/unity-2d-5.10.0/libunity-2d-private/src/dashclient.cpp:74
[WARNING] Object::connect: No such signal 
QDBusAbstractInterface::screenChanged(int) in 
/build/buildd/unity-2d-5.10.0/libunity-2d-private/src/dashclient.cpp:76
[WARNING] void DashClient::connectToDash(): Fetching Dash.active property 
failed 
[WARNING] void DashClient::connectToDash(): Fetching Dash.alwaysFullScreen 
property failed 
[WARNING] void DashClient::connectToDash(): Fetching Dash.screen property 
failed 
[WARNING] Object::connect: No such signal 
QDBusAbstractInterface::activeChanged(bool) in 
/build/buildd/unity-2d-5.10.0/libunity-2d-private/src/hudclient.cpp:71
[WARNING] Object::connect: No such signal 
QDBusAbstractInterface::screenChanged(int) in 
/build/buildd/unity-2d-5.10.0/libunity-2d-private/src/hudclient.cpp:73
[WARNING] void HUDClient::connectToHud(): Fetching HUD.active property failed 
[WARNING] void HUDClient::connectToHud(): Fetching Hud.screen property failed 

Some properties like Dash.active and HUD.active are shared between the
panel & the shell via dbus (when Dash/HUD open, panel reacts). These
errors imply that something is broken with this property sharing. I need
to dig more to determine what could be going wrong.

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https://bugs.launchpad.net/bugs/993694

Title:
  unity-2d does not start if user has logged in on unity

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