Virtualbox and virtualbox-guest-editions-iso are Unmatched versions in Ubunt Repos

I am running Ubuntu 15.10 (64 bit), and have had Virtualbox installed and operating successfully for some time.

On the 2 Feb 2016 when I ran "sudo apt-get dist-upgrade", a number of the upgrades installed effected Virtualbox, and included the following:

Upgrade: virtualbox:amd64 (5.0.10-dfsg-2ubuntu1, virtualbox-dkms:amd64 (5.0.10-dfsg-2ubuntu1, virtualbox-qt:amd64 (5.0.10-dfsg-2ubuntu1

Since this upgrade was installed, I have been unable to start any of the client operating systems installed in Virtualbox.

The error provided by Virtualbox when trying to start one of the client operating systems instance is:

                   Failed to open a session for the virtual machine Windows 10.

                    The device helper structure version has changed.

                     If you have upgraded VirtualBox recently, please make sure you have terminated all VMs and upgraded any
                     extension packs. If this error persists, try re-installing VirtualBox. (VERR_PDM_DEVHLPR3_VERSION_MISMATCH).

                    Result Code: NS_ERROR_FAILURE (0x80004005)
                   Component: ConsoleWrap
                    Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed}

A check within Synaptic shows that the following versions of Virtualbox and components are installed:

virtualbox installed version 5.0.14-dfsg-0ubuntu1.15.10.1

virtualbox-guest-additions-iso 5.0.4.1

A check of the "Latest Version" for virtualbox and virtualbox-guest-additions-ise shows that the installed versions are the latest versions offered in the Ubuntu Repositories

However, according to the error report shown above, the error is caused by the version of virtualbox-guest-additions.iso being a different version number to virtualbox itself.

Could someone please explain how I obtain a copy of virtualbox-guest-additions.iso 5.0.14 from the Ubuntu Repositories.

Until I can do so, I am unable to use Virtualbox.

Roy