Predbat Add-on error

Salve Conoscenti!
I would be interested to know if anyone has any ideas about why I have the following error when I try to add Predbat as an Add-on:
The command '/bin/bash -o pipefail -c apt-get update && apt-get upgrade -y' returned a non-zero code: 159

I have tried removing the Predbat Add-on, restarting HA and re-adding Predbat, but this makes no difference.

I an running HA core 2024.9.1 Supervisor 2024.09.1 in Home Assistant Supervised on a Pi 4 running Raspberry Pi OS.

Thank you very much for your advice.