Debian7:

cp -r /etc/apt/sources.list /etc/apt/sources.list.bak;echo "deb http://archive.debian.org/debian/ wheezy main contrib non-free" > /etc/apt/sources.list;cat /etc/apt/sources.list;apt-get update;

Debian8:

vi /etc/apt/sources.list

deb http://snapshot.debian.org/archive/debian/20190321T212815Z jessie main
deb-src http://snapshot.debian.org/archive/debian/20190321T212815Z jessie main
deb http://security.debian.org/ jessie/updates main
deb-src http://security.debian.org/ jessie/updates main

如果更新后出现：There is no public key available for the following key IDs: xxxxxxxxxxxxxxxx
可运行如下命令修复

aptitude install debian-keyring debian-archive-keyring

请输入图片描述

Last modification：August 13, 2019
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