This does suggest unity8-dash is starting but either
1. there is no mir server, such as unity8, running
2. MIR_SOCKET is not set to the correct mir server socket 
3. the permissions on the socket file mean dash cannot connect

We rely on upstart to ensure Dash starts when unity8 claims to be ready to 
accept connections. 
Upstart starts unity8, and puts it in the "starting" state. When unity8 is 
ready to accept client connections, it emits a SIGSTOP. Upstart intercepts this 
and SIGCONTs unity8. It then can start anything which requires the unity8 job 
to be "running" - such as unity8-dash.

It's also upstart's job to set the MIR_SOCKET env var, and other env
vars required. And to ensure permissions are correct.

So something in the above has gone wrong.

I am aware of unity8 not always shutting down correctly, which might
leave cruft behind. But I wold have thought upstart was cleaning that
cruft up, and only launching unity8-dash after a working unity8 had
started.

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https://bugs.launchpad.net/bugs/1475526

Title:
  unity8-dash crashes during power tests

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