same problem:

stellarmate@stellarmate:~ $ sudo apt-get update
Trovato:1 security.debian.org/debian-security bullseye-security InRelease
Trovato:2 deb.debian.org/debian bullseye InRelease
Trovato:3 deb.debian.org/debian bullseye-updates InRelease
Trovato:4 archive.raspberrypi.org/debian bullseye InRelease
Trovato:5 ppa.stellarmate.com/repos/apt/stable bullseye InRelease
Lettura elenco dei pacchetti... Fatto
N: Acquisizione del file "main/binary-armhf/Packages" saltata in quanto il repository "ppa.stellarmate.com/repos/apt/stable bullseye InRelease" non supporta l'architettura "armhf"

stellarmate@stellarmate:~ $ uname -a
Linux stellarmate 5.15.32-v8+ #1538 SMP PREEMPT Thu Mar 31 19:40:39 BST 2022 aarch64 GNU/Linux

directly from image 1.7.0 stable 64bit (SM-140)

sorry

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