kali linux 执行update更新后不能install安装软件

我的kali linux是1.0.7  目前的最新版  用的源是自带的kali源。但是执行 apt-get update之后 ，却依旧不能暗中软件，大致描述就是找不到这个包..

错误详细介绍

首先可以确定源是正确的

添加源之后 我依次执行

sudo apt-get update

sudo apt-get  upgrade

sudo apt-get install pptpd  //这里不管安装什么软件都出现下面这种提示..都提示不存在！

解决方法

更换下面的源  然后再update即可

deb http://http.kali.org/ /kali main contrib non-free
deb http://http.kali.org/ /wheezy main contrib non-free
deb http://http.kali.org/kali kali-dev main contrib non-free
deb http://http.kali.org/kali kali-dev main/debian-installer
deb-src http://http.kali.org/kali kali-dev main contrib non-free
deb http://http.kali.org/kali kali main contrib non-free
deb http://http.kali.org/kali kali main/debian-installer
deb-src http://http.kali.org/kali kali main contrib non-free
deb http://security.kali.org/kali-security kali/updates main contrib non-free
deb-src http://security.kali.org/kali-security kali/updates main contrib non-fr$