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| title | lang | published | description | image | tags | category | draft | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Upgrade from Debian 11 Bullseye to Debian 12 Bookworm | en | 2026-02-08T01:39:17.588Z | This guide explains how to upgrade from Debian 11 to Debian 12. Expect the upgrade to take about 20–30 minutes, mostly waiting for packages to download. |
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Operating Systems | false |
Upgrade from Debian 11 Bullseye to Debian 12 Bookworm
Expect the upgrade to take about 20–30 minutes, mostly waiting for packages to download.
Update APT sources
sudo nano /etc/apt/sources.list
Change every line that has:
bullseye main contrib non-free
to:
bookworm main contrib non-free non-free-firmware
Do this for all deb and deb-src lines. For example: deb http://deb.debian.org/debian/ bookworm main contrib non-free non-free-firmware
Upgrade Debian
sudo apt update
sudo apt upgrade --without-new-pkgs
sudo apt full-ugrade
sudo apt autoremove
Reboot and Verify
Reboot:
sudo reboot
Verify:
cat /etc/os-release
You should see PRETTY_NAME="Debian GNU/Linux 12 (bookworm)".