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Update /etc/apt/sources.list to:

If you are starting a new project, consider instead — it has newer software and longer active support. But if you specifically need Bullseye (e.g., legacy software compatibility), the above covers everything. iso debian 11

wget https://ftp-master.debian.org/keys/archive-key-11.asc gpg --import archive-key-11.asc Then verify: Update /etc/apt/sources

sha256sum -c SHA256SUMS --ignore-missing Import the Debian signing key: legacy software compatibility)