If you are getting a Kernel Panic accompanied by text such as
init: log.c:786: Assertion failes in log_clear_unflushed: log->remote_closed
Then see this thread: https://bugs.launchpad.net/ubuntu/+source/upstart/+bug/935585 regarding a bug introduced in a recent upstart package.
Fix is simple
- apt-get install python-software-properties
- add-apt-repository ppa:jamesodhunt/bug-935585
- apt-get update
- apt-get upgrade
When you reboot all should be great thanks to James Hunt.