Comment 3 for bug 1397801

It's most likely unity8-dash dead or launched in wrong order.

1. Please include the log in /home/phablet/.cache/upstart/unity8-dash.log
2. Please see if there is crash data in /var/crash/*unity8-dash*

If you find the files, please upload them to this bug report.

You can verify the unity8-dash is running or not by this command
$ initctl list|grep -i unity8-dash

and restart it to se if the user interface come back as you expected
$ restart unity8-dash