LINUX FIX: apt-get update: updating from such a repository can't be done securely and is disabled
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add [trusted=yes] to the sources.list
Example:
# deb cdrom:[Debian GNU/Linux 11.2.0 _Bullseye_ - Official amd64 DVD Binary-1 20211218-11:13]/ bullseye contrib main deb [trusted=yes] http://deb.debian.org/debian/ bullseye main deb-src [trusted=yes] http://deb.debian.org/debian/ bullseye main deb [trusted=yes] http://security.debian.org/debian-security bullseye-security main contrib deb-src [trusted=yes] http://security.debian.org/debian-security bullseye-security main contrib # bullseye-updates, to get updates before a point release is made; # see https://www.debian.org/doc/manuals/debian-reference/ch02.en.html#_updates_and_backports deb [trusted=yes] http://deb.debian.org/debian/ bullseye-updates main contrib deb-src [trusted=yes] http://deb.debian.org/debian/ bullseye-updates main contrib
