Thanks Mick,

I completely removed all the Virtualbox packages and reinstalled from the repository.
Still problems

I suppose the suggestion was to purge all the virtualbox packages from the repo, than trying to install the one provided by oracle. BTW this is the suggestion I would give you.

Mick

In desperation I removed all Virtualbox packages again with the package manager, then purged all instances of Virtualbox as suggested by Brian

I then reinstalled from the repository and the package manager responded with the following errors:

virtualbox

subprocess installed post-installation script returned error exit status 1

virtualbox-dkms

dependency problems - leaving unconfigured

virtualbox-qt

dependency problems - leaving unconfigured

I have had a look at the Oracle site but it appears that they do not yet provide packages for Utopic - only Trusty is mentioned. It appears to be the same as the one in the repository?

Thanks

Bob