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x86 用 ustc 源
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用清华 ubuntu-ports 镜像专门收 arm64 / armhf 等架构
/etc/apt/sources.list
# 1) x86_64 主源（amd64 架构），用中科大镜像
deb [arch=amd64] https://mirrors.ustc.edu.cn/ubuntu/ jammy main restricted universe multiverse
deb [arch=amd64] https://mirrors.ustc.edu.cn/ubuntu/ jammy-updates main restricted universe multiverse
deb [arch=amd64] https://mirrors.ustc.edu.cn/ubuntu/ jammy-backports main restricted universe multiverse
deb [arch=amd64] https://mirrors.ustc.edu.cn/ubuntu/ jammy-security main restricted universe multiverse
# 2) armhf / arm64 专用源，用清华 ubuntu-ports（国内速度好）
# 这是专门给 ARM 等非 x86 架构用的 ports 源<span data-allow-html class='source-item source-aggregated' data-group-key='source-group-0' data-url='https://mirrors.tuna.tsinghua.edu.cn/help/ubuntu-ports/' data-id='turn0fetch1'><span data-allow-html class='source-item-num' data-group-key='source-group-0' data-id='turn0fetch1' data-url='https://mirrors.tuna.tsinghua.edu.cn/help/ubuntu-ports/'><span class='source-item-num-name' data-allow-html>tuna.tsinghua.edu.cn</span><span data-allow-html class='source-item-num-count'>+1</span></span></span>
deb [arch=armhf,arm64] https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ jammy main restricted universe multiverse
deb [arch=armhf,arm64] https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ jammy-updates main restricted universe multiverse
deb [arch=armhf,arm64] https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ jammy-backports main restricted universe multiverse
deb [arch=armhf,arm64] https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ jammy-security main restricted universe multiverse