Automate installation of VirtualBox Guest Additions via command-line

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http://unix.stackexchange.com – How can I install VirtualBox Guest Additions from a Bash script, in a unattended way? Whenever I run apt-get -y install dkms virtualbox-guest-dkms from the terminal I'm presented with a interactive dialog, is there any way to safely bypass or pre-select the dialog choices? (HowTos)