$ gdebi virtualbox-5.0_5.0.14-105127-Ubuntu-trusty_amd64.deb
Reading package lists... Done
Building dependency tree
Reading state information... Done
Building data structures... Done
Building data structures... Done
This package is uninstallable
Breaks existing package 'virtualbox-4.3' that conflict: 'virtualbox'. But the 'virtualbox-5.0_5.0.14-105127-Ubuntu-trusty_amd64.deb' provides it via: 'virtualbox'