Debian LXC Upgrade From 12 to 13

Upgrading an LXC Container from Debian 12 to 13 is fairly straightforward.

This will replace the Bookworm Sources to the new Debian 13 Trixie sources in the Sources list. Add SUDO if not running as root.

sed -i 's/bookworm/trixie/g' /etc/apt/sources.list

Updating the available packages from the Trixie libraries will allow the container to know what is available.

apt update

After the packages list has been created the Distribution can be upgraded.

apt dist-upgrade

This might take a bit of time and may ask some questions about files that have been customized.

If unsure hit enter to go with then default.

When it is complete is a good time to reboot.

After the upgrade Sources should be Modernized so the sources are formatted in the new style format.

apt modernize-sources

Clean up after the upgrade

Auto removing old packages is a good idea to be done after any upgrade and clean the sources

apt-get autoremove --purge -y

apt-get clean

This will produce easy to read information on the container

hostnamectl

Or, check the os-release file

cat /etc/os-release

If the container runs Docker, this too should have the sources updated and an update run to ensure full compatibility.

sed -i 's/Suites: bookworm/Suites: trixie/' /etc/apt/sources.list.d/docker.sources

apt update

apt upgrade