BT5连接官方源较慢，更改为科大提供的源：
cd /etc/apt/
cp sources.list sources.list.bakcat sources.list
#https://www.haiyun.me
deb http://mirrors.ustc.edu.cn/backtrack/source revolution main microverse non-free testing
deb http://mirrors.ustc.edu.cn/backtrack/all revolution main microverse non-free testing
deb http://mirrors.ustc.edu.cn/backtrack/32 revolution main microverse non-free testing设置固定IP，默认为DHCP：
cat /etc/network/interfaces
auto eth0
iface eth0 inet static
address 192.168.1.31
netmask 255.255.255.0
gateway 192.168.1.1重启网络生效：
/etc/init.d/networking restart标签：bt5, bt5安装, bt5设置国内更新源, bt5固定IP设置