Virtualbox 4.2 not booting any virtual machines [duplicate]

This command must run with root privileges. Try:

sudo /etc/init.d/vboxdrv setup

Also try purging everything:

apt-get purge virtualbox-4.1 virtualbox-4.2

then reboot, reinstall VirtualBox 4.2, and run:

sudo apt-get -f install

to install any missing dependencies.

Run sudo /etc/init.d/vboxdrv setup again to make sure the VirtualBox kernel module is installed.

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