1.导出sources.list

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cat /etc/apt/sources.list >  sources.list

2.修改sources.list内容为如下：

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deb http://ftp.cn.debian.org/debian/ jessie main non-free contrib deb-src http://ftp.cn.debian.org/debian/ jessie main non-free contrib deb http://ftp.cn.debian.org/debian/ jessie-proposed-updates main non-free contrib deb-src http://ftp.cn.debian.org/debian/ jessie-proposed-updates main non-free contrib

或者

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deb http://mirrors.tuna.tsinghua.edu.cn/debian/ jessie main non-free contrib deb http://mirrors.tuna.tsinghua.edu.cn/debian/ jessie-proposed-updates main non-free contrib deb-src http://mirrors.tuna.tsinghua.edu.cn/debian/ jessie main non-free contrib deb-src http://mirrors.tuna.tsinghua.edu.cn/debian/ jessie-proposed-updates main non-free contrib

3.重新写回sources.list

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sudo su cat sources.list >  /etc/apt/sources.list

 4. 更新本地源仓库缓存

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sudo apt update