This involves the following:
1. Remove the cdrom as a package source
2. Add jessie-backports as a package source
3. Update the installation
4. Add the required packages
1. Remove the cdrom as a package source
As a privileged user, edit the /etc/apt/sources.list file and put a hash character in front of any line starting with 'deb cdrom':
$
sudo vi /etc/apt/sources.list
2. Add jessie-backports as a package source
Add the following three lines (if you're using the GB mirror) to your sources.list:
# jessie-backports
deb http://gb.mirror.devuan.org/merged/ jessie-backports main contrib
deb-src http://gb.mirror.devuan.org/merged/ jessie-backports main contrib
Adjust the URL if you are using a different mirror to what you are using for e.g. jessie-updates
3. Update the installation
$
sudo apt update
$
sudo apt dist-upgrade
$
sudo apt autoremove
$
sudo apt autoclean
4. Identify your kernel architecture:
$
uname -a
Linux devuan 3.16.0-4-
amd64 #1 SMP Debian 3.16.43-2 (2017-04-30) x86_64 GNU/Linux
4. Add the required packages, replace amd64 with the architecture identified above as appropriate:
$ sudo apt install virtualbox-guest-utils virtualbox-guest-x11 virtualbox-guest-dkms dkms linux-headers-amd64 build-essential