Daher muss man im ersten Schritt die Paketquellen aktualisieren.
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nano /etc/apt/sources.list
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deb http://archive.debian.org/debian buster main contrib non-free
deb http://archive.debian.org/debian-security buster/updates main contrib non-free
deb http://archive.debian.org/debian buster-backports main contrib non-free
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apt update
apt upgrade
https://www.keyweb.de/de/keyhelp/entwic ... -debian-11
Happy updating!