Remover versão anterior, se necessário
sudo apt-get remove virtualbox-4.1
Instalar virtualbox 4.2
echo "deb http://download.virtualbox.org/virtualbox/debian $(lsb_release -sc) contrib" | sudo tee /etc/apt/sources.list.d/virtualbox.list wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | sudo apt-key add - sudo apt-get update && sudo apt-get install virtualbox-4.2
Habilitar suporte USB 2.0 Instalar Oracle VM VirtualBox Extension Pack http://www.oracle.com/technetwork/server-storage/virtualbox/downloads/index.html#extpack
Editar /etc/group e adicionar o seu username na linha com vboxuser sudo gedit /etc/group vboxusers:x:125:username