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Using Debian Long Term Support (LTS)
Important: The current LTS version is Debian 11 ("bullseye") and will be supported until August 31st, 2026. Supported architectures in Debian 11 LTS are limited to amd64, i386, arm64 and armhf. Users of other architectures are especially encouraged to upgrade to Debian 12 (''bookworm'').
To receive security updates for Debian 11, your /etc/apt/sources.list should look like this one:
deb http://deb.debian.org/debian/ bullseye main contrib non-free deb-src http://deb.debian.org/debian/ bullseye main contrib non-free deb https://deb.debian.org/debian-security bullseye-security main contrib deb-src https://deb.debian.org/debian-security bullseye-security main contrib
Note that if you already follow security.debian.org (and you should), this should mostly be a no-op. In other words, Debian LTS reuses the same mirror infrastructure as the regular release team, it's just a responsibility handover.
To follow security announcements, you may also want to subscribe to the debian-lts-announce mailing list.
Recommendations for upgrading from Debian 10 to Debian 11
Please read the official release notes for bullseye and take a look at issues to be aware of for bullseye.
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 (buster or bullseye), unstable 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.