How can I upgrade from buster to bullseye using dvd1?
Posted: 2021-11-25 07:37
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mount -o loop -t iso9660 dvd1.iso /home/user/debian11
in /etc/apt/sources.list
deb file:///home/user/debian11 bullseye main contrib
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Reading package lists... Done
E: The repository 'file:/home/user/debian11 bullseye Release' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.