# Proxmox Debian LXC upgrade to Bookworm

Tags: Proxmox Homelab Linux Debian Selfhosting

Reading time: 1 minute

Description: A quick summary on the upgrade process of LXC's to Debian 12 (Bookworm)

On the 10.06.2023 Debian 12 (Bookworm) was released as stable, this is a short summary on the upgrade process of LXC’s.

It’s a good idea to check for and remove orphaned packages before upgrading.

To list those:

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apt list '~o'

Remove those and update the mirror config from debian, if you have any other sources, check if they are compatible and also update them.

In /etc/apt/sources.list and under /etc/apt/sources.list.d/ replace all occurrences of your old distribution name to bookworm:

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deb http://ftp.debian.org/debian bookworm main contrib

deb http://ftp.debian.org/debian bookworm-updates main contrib

deb http://security.debian.org bookworm-security main contrib

After updating the mirror config, download the package information with

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apt update

• upgrade the system

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apt upgrade

• do a full upgrade

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apt full-upgrade

• remove old packages

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apt autoremove

• and reboot

Now the upgrade should be done, there may be extra work needed depending on the software installed in the container.

For example in my Mastodon LXC i had to redownload the dependencies with bundle install --redownload since a library was missing.