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Install Debian on OS X Virtual Box Host

Download and install Virtual Box for OS X: https://www.virtualbox.org/wiki/Downloads
Download Debian Net Install: https://www.debian.org/CD/netinst/
Create a new machine named e.g. “Debian” and run it.
Select the Net Install disk (e.g. debian-8.2.0-amd64-netinst.iso) and start the installation
After the first successful login you may want to make your first snapshot
Login to the newly installed debian machine

To install the Guest Additions, start a terminal and type :

$ su
# aptitude update && aptitude safe-upgrade
# aptitude install module-assistant build-essential linux-headers-generic dkms
# m-a prepare

Click on Install Guest Additions… from the Devices menu. This will mount the disk in /media/cdrom and install the Guest Additions:
```
# sh /media/cdrom/VBoxLinuxAdditions.run
```
And Finally, reboot your machine:
```
# reboot
```
After this installation, you may want to make one more snapshot