Installing Debian 11.9

Debian 11 has been superseded by Debian 12 (bookworm). Some of these installation images may no longer be available, or may no longer work, and you are recommended to install bookworm instead.

To install Debian 11.9 (bullseye), 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.

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



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


This is a list of known problems in the installer shipped with Debian 11.9. 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 11.0

Firmwares required for some sound cards
There seems to be a number of sound cards that require loading a firmware to be able to emit sound. As of Bullseye, the installer is not able to load them early, which means that speech synthesis during installation is not possible with such cards. A possible workaround is to plug another sound card which does not need such firmware. See the umbrella bug report to keep track of our efforts.

Improved versions of the installation system are being developed for the next Debian release, and can also be used to install bullseye. For details, see the Debian-Installer project page.