VirtualBox 4.2.0 Released With Support For Drag n drop

The new host to Linux guests drag’n’drop support feature requires the installation of VirtualBox Guest Additions. To get it working in Ubuntu, make sure you don’t install the Guest Additions package available in the official Ubuntu repository (“virtualbox-guest-additions”) and instead, install the Guest Additions from the VirtualBox menu (Devices > Install Guest Additions).

For some of the new features like starting VMs on system boot, see the VirtualBox manual for how to use them.