You appear to have a version of the VBoxGuestAdditions software
on your system which was installed from a different source or using a
different type of installer.  If you installed it from a package from your
Linux distribution or if it is a default part of the system then we strongly
recommend that you cancel this installation and remove it properly before
installing this version. If this is simply and older or a damaged
installation you may safely proceed.

dpkg -l | grep virtualbox

ii   virtualbox-ose-guest-dkms ...
ii   virtualbox-ose-guest-utils ...
ii   virtualbox-ose-guest-x11 ...

apt-get remove virtualbox-ose-guest-dkms virtualbox-ose-guest-utils virtualbox-ose-guest-x11

apt-get remove virtualbox-guest-additions

sh ./VBoxLinuxAdditions.run uninstall

apt-get autoremove virtualbox-ose-guest-dkms
        virtualbox-ose-guest-utils virtualbox-ose-guest-x11