Update Debian Bullseye (11)to Bookworm (12) in ChromeOS

Linux container after upgrade to Debian Bookworm

The Debian 12 or Debian Bookworm comes with many improvements as compared to Debian 11. These improvements consist of security, performance, and stability. Debian 12 also supports the “Wayland Display Server” which gives appealing themes to Debian 12. It also comes with the latest version of the Kernel which is 6.1.

In this case, I want to upgrade to Debian 12 to enable Flatpack support and enable PHP environment setup for my future Projects.

How to upgrade:

1. Update existing Debian Bullseye to latest version (sudo apt update && sudo apt dist-upgrade)
2. Update file /etc/apt/sources.list and /etc/apt/sources.list.d/cros.list to below using your favorite text editor.

Update sources.list & cros.list from bullseye to bookworm

3. Update to latest version (sudo apt update && sudo apt dist-upgrade), press Y & enter when prompted below

Upgrade confirmation

4. Wait installation progress, this might take a long time. When done, you’ll see the following screen.

Upgrade completion

5. Exit VM / Console and reopen, your Linux VM should be using Debian Bookworm

Linux VM using Debian Bookworm

That's it, see you on next article.

Cheers!