Debian 8 apt-get update 失败解决方法

萌樱用 Debian 8 时 apt-get update 失败了，出现了以下错误

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W: Failed to fetch http://ftp.debian.org/debian/dists/jessie-updates/InRelease Unable to find expected entry 'main/source/Sources' in Release file (Wrong sources.list entry or malformed file)

E: Some index files failed to download. They have been ignored‚ or old ones used instead.

运行以下命令换源即可

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printf "deb http://archive.debian.org/debian/ jessie main\ndeb-src http://archive.debian.org/debian/ jessie main\ndeb http://security.debian.org jessie/updates main\ndeb-src http://security.debian.org jessie/updates main" > /etc/apt/sources.list
apt-get update

官方消息：Removal of Wheezy and Jessie (except LTS) from mirrors