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Using Debian Long Term Support (LTS)
Important: see LTS for the current LTS support schedule and architectures. Users of other architectures are especially encouraged to upgrade to Debian 13 trixie.
To receive security updates for LTS, your /etc/apt/sources.list should look like this one:
deb http://deb.debian.org/debian/ bookworm main contrib non-free-firmware non-free deb-src http://deb.debian.org/debian/ bookworm main contrib non-free-firmware non-free deb https://deb.debian.org/debian-security bookworm-security main contrib non-free-firmware non-free deb-src https://deb.debian.org/debian-security bookworm-security main contrib non-free-firmware non-free
Debian LTS is just a responsibility handover and reuses the same mirror infrastructure as the regular Release/Security Teams. If you already follow security.debian.org (highly recommended), you'll automatically get LTS updates.
To follow security announcements, subscribe to the debian-lts-announce mailing list.
Recommendations for upgrading from Debian 11 to Debian 12
Please read the official release notes for bookworm and take a look at issues to be aware of for bookworm.
Update your /etc/apt/sources.list according to the list above.
Update your system: apt-get update
Upgrade your system: apt upgrade
Upgrade your system and remove obsolete packages: apt dist-upgrade
- Carefully check all debconf prompts and update configuration files as needed.
Additional repositories
You can add other repositories.
If you want more info on which mirrors to use, read debian mirrors.
Check for unsupported packages
Not all packages of the Debian archive are supported by LTS. To check whether you have unsupported packages installed on your machine, please install the debian-security-support package (use the version from the release installed in your machine, unstable's will not work as expected). A check for new unsupported packages is run every time packages are installed. You can also run the check-support-status utility manually to get a list of all unsupported packages installed on your system.
What can I do if security support for a package has ended?
You can choose between different options:
- Remove the unmaintained package.
- Keep the software and make sure that neither already known nor new security issues affect your system.
If you want to provide patches subscribe to LTS/Contact#debian-lts and present your idea.