sudo modprobe -r vboxdrv vboxnetflt vboxnetadp ; sudo aptitude update && sudo aptitude install virtualbox-ose virtualbox-ose-dkms
FATAL: Module vboxdrv not found.
Hit http://http.us.debian.org unstable Release.gpg
Ign http://http.us.debian.org unstable/main Translation-en_US
Hit http://http.us.debian.org unstable Release
Hit http://http.us.debian.org unstable/main Packages/DiffIndex
Hit http://http.us.debian.org unstable/main Sources/DiffIndex
Reading package lists... Done

Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information... Done
Initializing package states... Done
Reading task descriptions... Done
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 287 not upgraded.
Need to get 0B of archives. After unpacking 0B will be used.
Writing extended state information... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information... Done
Initializing package states... Done
Reading task descriptions... Done