Although if your USC/Unity8 is crashing for some other reason than bug 1536662, I guess you would also see the same broken login screen.
So it really depends: Does it take 30 seconds to return you to the login screen or is it immediate?
Please attach these files so we can find out what the cause is: ~/.cache/upstart/unity8.log /var/log/lightdm/unity-system-compositor.log
Although if your USC/Unity8 is crashing for some other reason than bug 1536662, I guess you would also see the same broken login screen.
So it really depends: Does it take 30 seconds to return you to the login screen or is it immediate?
Please attach these files so we can find out what the cause is: upstart/ unity8. log log/lightdm/ unity-system- compositor. log
~/.cache/
/var/