Welcome to Ubuntu 19.10 (GNU/Linux 5.3.0-1014-raspi2 aarch64)
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$ sudo vim /etc/apt/sources.list.d/tsinghua.source.list
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# 默认注释了源码镜像以提高 apt update 速度如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ eoan main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ eoan main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ eoan-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ eoan-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ eoan-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ eoan-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ eoan-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ eoan-security main restricted universe multiverse
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$ uname -a
Linux ubuntu 5.3.0-1014-raspi2 #16-Ubuntu SMP Tue Nov 26 11:18:23 UTC 2019 aarch64 aarch64 aarch64 GNU/Linux
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