Installing Debian 9.9

Debian 9 has been superseded by Debian 10 (buster). Some of these installation images may no longer be available, or may no longer work, and you are recommended to install buster instead.

To install Debian 9.9 (stretch), download any of the following images (all i386 and amd64 CD/DVD images can be used on USB sticks too):

netinst CD image (generally 150-280 MB)

Blu-ray (via jigdo)

other images (netboot, flexible usb stick, etc.)

If any of the hardware in your system requires non-free firmware to be loaded with the device driver, you can use one of the tarballs of common firmware packages or download an unofficial image including these non-free firmwares. Instructions how to use the tarballs and general information about loading firmware during an installation can be found in the Installation Guide (see Documentation below).

netinst (generally 240-290 MB) non-free CD images with firmware

Notes

Documentation

If you read only one document before installing, read our Installation Howto, a quick walkthrough of the installation process. Other useful documentation includes:

Errata

This is a list of known problems in the installer shipped with Debian 9.9. If you have experienced a problem installing Debian and do not see your problem listed here, please send us an installation report describing the problem or check the wiki for other known problems.

Errata for release 9.0

APT was vulnerable to a man-in-the-middle attack
A bug in the APT HTTP transport method (CVE-2019-3462) could be exploited by an attacker located as a man-in-the-middle between APT and a mirror to cause the installation of additional, malicious, packages.
This can be mitigated by disabling use of the network during initial installation and then upgrading following the instructions in DSA-4371.
Status: This has been fixed in 9.7