mesonosist64
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Step 1 - Install the Armbian PGP key and update your APT sources
Install armbian.gpg to /usr/share/keyrings/armbian.gpg (mode 644) You can use a copy from another one of your SBCs, or... ... you can download and install like below (thanks @BrewNinja for the example) touch /usr/share/keyrings/armbian.gpg chmod 644 /usr/share/keyrings/armbian.gpg wget https://apt.armbian.com/armbian.key -O - | gpg --dearmor >/usr/share/keyrings/armbian.gpg
Edit /etc/apt/sources.list Replace all instances of bullseye with bookworm Edit /etc/apt/sources.list.d/armbian.list deb [signed-by=/usr/share/keyrings/armbian.gpg] http://apt.armbian.com bookworm main bookworm-utils bookworm-desktop
Edit any other files in /etc/apt/sources.list.d as appropriate, to replace bullseye with bookworm
Step 2
apt update
Step 3
NOTE - WHEN RUNNING THE BELOW COMMANDS, DO NOT ACCEPT ANY INTERACTIVE PROMPTS FOR CHANGING /etc/initramfs-tools/initramfs.conf
The default is not to accept the changes anyway - but I am noting this here to be extra careful I've checked - the changes may differ from what armbian has in the latest images
apt upgrade --no-new-pkgs apt full-upgrade apt dist-upgrade