Thanks to 2hot6ft2 for the suggestion to look in /etc/fstab for a drive that may be lost...
I had reference to a USB drive that was not attached. Don't know why yet!!!
So, I commented out the lines referring to it and Hey Presto - no more message.
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I get the following message at boot...
keys: Press S to skip mounting or M for manual recovery.
I am unsure what this means. It appears now every time I reboot and I can't tell if it is related to installing VirtualBox or perhaps it has occurred after the last Update to Ultimate Edition 2.7.
Can anyone clarify what the message means and what I have to do about it.
At the moment I press S to skip and everything appears to load as normal. I have tried M for maunual recovery but, I get through to a command line and don't know what to do.
Thanks.