Installation and download options

Where to find additional information

We recommend that you read or at least take a look at the release notes for Debian Stretch before you start installing a system for production use. Please give Debian Edu/Skolelinux a try, it should just work. :-)

/!\ Be sure to read the getting started chapter of this manual, though, as it explains how to log in for the first time.

Even more information about the Debian Stretch release is available in its installation manual.

Download the installation media for Debian Edu 9+edu0 Codename Stretch

netinstall CD image for i386, amd64

The netinstall CD, which also can be used for installation from USB flash drives, is suitable to install i386 and amd64 machines. As the name implies, internet access is required for the installation. It's available via

USB drive ISO image for i386 and amd64

The multi-architecture ISO image is 5.5 GiB large and can be used for installation of amd64 and i386 machines. Like the netinstall image it can be installed on USB flash drives or disk media of sufficient size. Please note that internet access is needed during installation if the 'LTSP Server' profile is chosen. Like the others it can be downloaded over HTTP or rsync via:


Sources are available from the Debian archive at the usual locations.

Request a CD / DVD by mail

For those without a fast Internet connection, we can offer a CD or DVD sent for the cost of the CD or DVD and shipping. Just send an email to and we will discuss the payment details (for shipping and media). :) Remember to include the address you want the CD or DVD to be sent to in the email.

Installing Debian Edu

When you do a Debian Edu installation, you have a few options to choose from. Don't be afraid; there aren't many. We have done a good job of hiding the complexity of Debian during the installation and beyond. However, Debian Edu is Debian, and if you want there are more than 52,000 packages to choose from and a billion configuration options. For the majority of our users, our defaults should be fine.

Installation types and options

Installer boot menu on 64-bit Hardware

64-bit Installer boot menu

Graphical install uses the GTK installer where you can use the mouse.
Install uses text mode.
Advanced options > gives a sub menu with more detailed options to choose.
32-bit install options > allows a 32-bit installation on 64-bit hardware.
Help gives some hints on using the installer; see screenshot below.

64-bit Installer advanced options screen 1

Back.. brings back to the main menu.
Graphical expert install gives access to all available questions, mouse usable.
Graphical rescue mode makes this install medium become a rescue disk for emergency tasks.
Graphical automated install needs a preseed file.
Expert install gives access to all available questions in text mode.
Rescue mode text mode; makes this install medium become a rescue disk for emergency tasks.
Automated install text mode; needs a preseed file.

Installer boot menu on 32-bit Hardware

32-bit Installer boot menu

Explanations are similar to those for 64-bit hardware.

Help screen

Installer help screen

This Help screen is self explaining and enables the <F>-keys on the keyboard for getting more detailed help on the topics described.

Add or change boot parameters for installations

In both cases, boot options can be edited by pressing the TAB key in the boot menu; the screenshot shows the command line for Graphical install.

Edit command line options

The installation process

Remember the system requirements and make sure you have at least two network cards (NICs) if you plan on setting up an LTSP server.

Notes on some characteristics

A note on notebooks

Most likely you will want to use the 'Roaming workstation' profile (see above). Be aware that all data is stored locally (so take some extra care over backups) and login credentials are cached (so after a password change, logins may require your old password if you have not connected your laptop to the network and logged in with the new password).

A note on multi-arch USB flash drive / Blu-ray disc image installs

After you install from the multi-arch USB flash drive / Blu-ray disc image, /etc/apt/sources.list will only contain sources from that image. If you have an Internet connection, we strongly suggest adding the following lines to it so that available security updates can be installed:

deb stretch main 
deb stretch/updates main 

A note on CD installs

A netinst installation (which is the type of installation our CD provides) will fetch some packages from the CD and the rest from the net. The amount of packages fetched from the net varies from profile to profile but stays below a gigabyte (unless you choose to install all possible desktops). Once you have installed the main-server (whether a pure main-server or combi-server does not matter), further installation will use its proxy to avoid downloading the same package several times from the net.

Notes on LTSP Server installations using only Thin-Clients

Providing the kernel boot parameter edu-skip-ltsp-make-client makes it possible to skip one step which converts the LTSP chroot from a thin-client chroot into a combined thin-client/diskless workstation chroot.

This is useful in certain situations, such as if you want a pure thin client chroot or if there is already a diskless chroot on another server, which can be rsynced. For these situations skipping this step will cut down the installation time considerably.

Except for the longer installation time there is no harm in always creating combined chroots, which is why this is done by default.

Installation using USB flash drives instead of CD / Blu-ray discs

Since the Squeeze release it is possible to directly copy the CD/DVD/BD .iso images to a USB flash drive (also known as "USB sticks") and boot from them. Simply execute a command like this, just adapting the file and device names to your needs:

sudo dd if=debian-edu-amd64-i386-XXX.iso of=/dev/sdX bs=1024

Depending on which image you choose, the USB flash drive will behave just like a CD or Blu-ray disc.

Installation over the network (PXE) and booting diskless clients

For this installation method it is required that you have a running main server. When clients boot via the main network, a new PXE menu with installer and boot selection options is displayed. If PXE installation fails with an error message claiming a XXX.bin file is missing, then most probably the client's network card requires nonfree firmware. In this case the Debian Installer's initrd must be modified. This can be achieved by executing the command: /usr/share/debian-edu-config/tools/pxe-addfirmware  on the server.

This is how the PXE menu looks with the Main-Server profile only:


This is how the PXE menu looks with the Main Server and LTSP Server profiles:


To install a desktop environment of your choice instead of the default one, press TAB and edit the kernel boot options (like explained above).

This setup also allows diskless workstations and thin clients to be booted on the main network. Unlike workstations, diskless workstations don't have to be added to LDAP with GOsa², but can be, for example if you want to force the hostname.

More information about network clients can be found in the Network clients HowTo chapter.

Modifying PXE installations

The PXE installation uses a debian-installer preseed file, which can be modified to ask for more packages to install.

A line like the following needs to be added to tjener:/etc/debian-edu/www/debian-edu-install.dat

d-i    pkgsel/include string my-extra-package(s)

The PXE installation uses /var/lib/tftpboot/debian-edu/install.cfg and the preseeding file in /etc/debian-edu/www/debian-edu-install.dat. These files can be changed to adjust the preseeding used during installation, to avoid more questions when installing over the net. Another way to achieve this is to provide extra settings in /etc/debian-edu/pxeinstall.conf and /etc/debian-edu/www/debian-edu-install.dat.local and to run /usr/sbin/debian-edu-pxeinstall to update the generated files.

Further information can be found in the manual of the Debian Installer.

To disable or change the use of the proxy when installing via PXE, the lines containing mirror/http/proxy, mirror/ftp/proxy and preseed/early_command in tjener:/etc/debian-edu/www/debian-edu-install.dat  need to be changed. To disable the use of a proxy when installing, put '#' in front of the first two lines, and remove the "export http_proxy="http://webcache:3128"; " part from the last one.

Some settings can not be preseeded because they are needed before the preseeding file is downloaded. These are configured in the PXElinux-based boot arguments available from /var/lib/tftproot/debian-edu/install.cfg. Language, keyboard layout and desktop are examples of such settings.

Custom images

Creating custom CDs, DVDs or Blu-ray discs can be quite easy since we use the Debian Installer, which has a modular design and other nice features. Preseeding allows you to define answers to the questions normally asked.

So all you need to do is to create a preseeding file with your answers (this is described in the appendix of the Debian Installer manual) and remaster the CD/DVD.

Screenshot tour

The text mode and the graphical installation are functionally identical - only the appearance is different. The graphical mode offers the opportunity to use a mouse, and of course looks much nicer and more modern. Unless the hardware has trouble with the graphical mode, there is no reason not to use it.

So here is a screenshot tour through a graphical 64-bit Main Server + Workstation + LTSP Server installation and how it looks at the first boot of the main server, a PXE boot on the workstation network and on the LTSP client network:

















13-Install the base system.png



18-Build LTSP chroot.png





tjener KDM Login

KDE and Browser

KDE Desktop


Diskless Workstation Login

KDE Desktop and Menu