Hi @marcoalvarado,
Thank you for your interest in Kolibri. The Kolibri Raspberry Pi image isn’t yet compatible with the Pi 5. Apologies that we missed your message here, but I did successfully test the debian installation process on a Pi 5.
Could you try using the first method listed here to add the PPA. The first method will manually install the PPA instead of using add-apt-repository.
I will relay your interest in support for the Pi 5 to our product team.
Regards,
Blaine