(Reading database ... 623235 files and directories currently installed.)
Unpacking virtualbox-4.2 (from virtualbox-4.2_4.2.4-81684~Ubuntu~precise_amd64.deb) ...
dpkg: error processing virtualbox-4.2_4.2.4-81684~Ubuntu~precise_amd64.deb (--install):
 trying to overwrite '/usr/share/virtualbox/VBoxGuestAdditions.iso', which is also in package virtualbox-guest-additions-iso 4.1.12-1
dpkg-deb (subprocess): subprocess data was killed by signal (Broken pipe)
dpkg-deb: error: subprocess <decompress> returned error exit status 2
Processing triggers for ureadahead ...
Processing triggers for shared-mime-info ...
Unknown media type in type 'all/all'
Unknown media type in type 'all/allfiles'
Unknown media type in type 'uri/mms'
Unknown media type in type 'uri/mmst'
Unknown media type in type 'uri/mmsu'
Unknown media type in type 'uri/pnm'
Unknown media type in type 'uri/rtspt'
Unknown media type in type 'uri/rtspu'
Processing triggers for bamfdaemon ...
Rebuilding /usr/share/applications/bamf.index...
Processing triggers for desktop-file-utils ...
Processing triggers for gnome-menus ...
Processing triggers for hicolor-icon-theme ...
Errors were encountered while processing:
 virtualbox-4.2_4.2.4-81684~Ubuntu~precise_amd64.deb