当您使用 DVD 安装 Debian 11 时，如果您没有选择扫描网络镜像，操作系统安装程序会将 DVD 设置为为您的系统获取软件包的来源。
由于这个原因，当您尝试安装任何软件时，如果 DVD 驱动器中没有光盘，系统会要求您插入 DVD。 此外，DVD 上的软件包可能不是最新版本。 所以，我们需要从网上获取包。
Media change: please insert the disc labeled 'Debian GNU/Linux 11.0.0 _Bullseye_ - Official amd64 DVD Binary-1 20210814-10:04' in the drive '/media/cdrom/' and press [Enter]
这 /etc/apt/sources.list 以 DVD 为来源的文件将如下所示。
# deb cdrom:[Debian GNU/Linux 11.0.0 _Bullseye_ - Official amd64 DVD Binary-1 20210814-10:04]/ bullseye contrib main deb cdrom:[Debian GNU/Linux 11.0.0 _Bullseye_ - Official amd64 DVD Binary-1 20210814-10:04]/ bullseye contrib main deb https://security.debian.org/debian-security bullseye-security main contrib deb-src https://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 # A network mirror was not selected during install. The following entries # are provided as examples, but you should amend them as appropriate # for your mirror of choice. # # deb https://deb.debian.org/debian/ bullseye-updates main contrib # deb-src https://deb.debian.org/debian/ bullseye-updates main contrib
Debian 11：官方sources.list
要在您的系统上设置 Debian 11 官方存储库，请添加/更新 /etc/apt/sources.list 包含以下详细信息的文件。
deb https://deb.debian.org/debian/ bullseye main deb-src https://deb.debian.org/debian/ bullseye main deb https://security.debian.org/debian-security bullseye-security main contrib deb-src https://security.debian.org/debian-security bullseye-security main contrib deb https://deb.debian.org/debian/ bullseye-updates main contrib deb-src https://deb.debian.org/debian/ bullseye-updates main contrib
Debian 11：贡献与非自由
如果你想收到 贡献 和 非免费 适用于您系统的软件包，请使用以下软件包。
deb https://deb.debian.org/debian bullseye main contrib non-free deb-src https://deb.debian.org/debian bullseye main contrib non-free deb https://deb.debian.org/debian-security bullseye/updates main contrib non-free deb-src https://deb.debian.org/debian-security bullseye/updates main contrib non-free deb https://deb.debian.org/debian bullseye-updates main contrib non-free deb-src https://deb.debian.org/debian bullseye-updates main contrib non-free
Debian 11：向后移植
如果您想添加 向后移植，更新 来源.list 与以下信息。
deb https://deb.debian.org/debian bullseye-backports main contrib non-free deb-src https://deb.debian.org/debian bullseye-backports main contrib non-free
更新
添加存储库后，更新存储库索引。
sudo apt update
结论
就这样。 我希望这篇文章能帮助您在 Debian 11 系统上添加所需的存储库，以便从 Internet 获取最新的软件包。
