Installing Virtualbox’s Guest Additions on Debian and getting shared folders to work

Follow these steps to install the Guest Additions on your Debian virtual machine:

1. Login as root;
2. Update your APT database with apt-get update;
3. Install the latest security updates with apt-get upgrade;
4. Install required packages with apt-get install build-essential module-assistant;
5. Configure your system for building kernel modules by running m-a prepare;
6. Click on Install Guest Additions… from the Devices menu, then run mount /media/cdrom.
7. Run sh /media/cdrom/, and follow the instructions on screen.

Once you install and reboot, then you can add shared folders from the device menu, and mount it with the following command:

# mount.vboxsf [the_name_of_the_shared_folder] /media/[name_of_mount_point]