ubuntu/debain apt-get update报错 W: Failed to fetch XXX Hash Sum mismatch解决办法

本文提供了几种修改sources.list文件的方法，以解决在Ubuntu系统中使用apt-get更新时遇到的Hash Sum mismatch错误。通过更改源地址，可以有效避免更新过程中出现的校验失败问题。

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apt-get update报错：

W: Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/bionic-security/universe/binary-amd64/Packages  Hash Sum mismatch

vi /etc/apt/sources.list.d/mono-official-beta.list

改成：

deb http://deb.debian.org/debian buster main contrib non-free
deb-src http://deb.debian.org/debian buster main contrib non-free

deb http://deb.debian.org/debian-security/ buster/updates main contrib non-free
deb-src http://deb.debian.org/debian-security/ buster/updates main contrib non-free

deb http://deb.debian.org/debian buster-updates main contrib non-free
deb-src http://deb.debian.org/debian buster-updates main contrib non-free

再apt-get update就成功了。

要是这个不行的话，还可以改成：

deb http://deb.debian.org/debian buster main
deb-src http://deb.debian.org/debian buster main

deb http://deb.debian.org/debian-security/ buster/updates main
deb-src http://deb.debian.org/debian-security/ buster/updates main

deb http://deb.debian.org/debian buster-updates main
deb-src http://deb.debian.org/debian buster-updates main

要是这个也不行的话，还可以改成：

deb http://deb.debian.org/debian buster-backports main contrib non-free
deb-src http://deb.debian.org/debian buster-backports main contrib non-free