更换apt-get官方源为163源

1.# mv /etc/apt/sources.list /etc/apt/sources.list.bak

2.覆盖原来源文件

tee /etc/apt/sources.list <<-'EOF'
deb http://mirrors.163.com/debian/ jessie main non-free contrib

deb http://mirrors.163.com/debian/ jessie-updates main non-free contrib

deb http://mirrors.163.com/debian/ jessie-backports main non-free contrib

deb-src http://mirrors.163.com/debian/ jessie main non-free contrib

deb-src http://mirrors.163.com/debian/ jessie-updates main non-free contrib

deb-src http://mirrors.163.com/debian/ jessie-backports main non-free contrib

deb http://mirrors.163.com/debian-security/ jessie/updates main non-free contrib

deb-src http://mirrors.163.com/debian-security/ jessie/updates main non-free contrib

EOF