像我这种一般想起才玩玩BT5的人，跟不上讯息的变化。
偶尔想尝试某个实验，然后去安装，发现提示无法找到软件安装包。
这个时候，应该注意到，现在已经从BT5到kali了，假如想我这种人，肯定比较少留意软件源地址。原来的BT5的软件源有些已经跟不上了。所以我们应该修改BT5下的软件源
123456789 vi /etc/apt/sources.list
#将下列地址复制进去就好
deb kali main non-free contrib
deb-src kali main non-free contrib
deb kali/updates main contrib non-free
#然后我们导入公钥
sudo apt-key adv --keyserver pgp.mit.edu --recv-keys ED444FF07D8D0BF6
#之后我们更新一下，
apt-get update
上面这个是中科大的软件源
下面给出软件源的列表
中科大软件源
deb kali main non-free contrib
deb-src kali main non-free contrib
deb kali/updates main contrib non-free
kali官方源的地址：
deb kali main non-free contrib
deb-src kali main non-free contrib
deb kali/updates main contrib non-free
kali新加坡源的地址：
deb kali main non-free contrib
deb-src kali main non-free contrib
deb kali/updates main contrib non-free
deb kali/updates main contrib non-free
deb-src kali/updates main contrib non-free
kali国内源的地址：
deb wheezy main non-free contrib
deb-src wheezy main non-free contrib
deb wheezy-proposed-updates main non-free contrib
deb-src wheezy-proposed-updates main non-free contrib
deb wheezy/updates main non-free contrib
deb-src wheezy/updates main non-free contrib
deb wheezy main non-free contrib
deb-src wheezy main non-free contrib
deb wheezy-proposed-updates main non-free contrib
deb-src wheezy-proposed-updates main non-free contrib
deb-src wheezy/updates main non-free contrib
deb wheezy/updates main non-free contrib
我们最好使用中科大或者国内的！