更新Kali Linux的更新源：
修改/etc/apt/sources.list文件，然后根据自身情况修改为以下较快的源：

#官方源
deb http://http.kali.org/kali kali main non-free contrib
deb-src http://http.kali.org/kali kali main non-free contrib
deb http://security.kali.org/kali-security kali/updates main contrib non-free

#中科大kali源
deb http://mirrors.ustc.edu.cn/kali kali main non-free contrib
deb-src http://mirrors.ustc.edu.cn/kali kali main non-free contrib
deb http://mirrors.ustc.edu.cn/kali-security kali/updates main contrib non-free

#新加坡kali源
deb http://mirror.nus.edu.sg/kali/kali/ kali main non-free contrib
deb-src http://mirror.nus.edu.sg/kali/kali/ kali main non-free contrib
deb http://mirror.nus.edu.sg/kali/kali-security kali/updates main contrib non-free
deb-src http://mirror.nus.edu.sg/kali/kali-security kali/updates main contrib non-free

#debian_wheezy国内源
deb http://ftp.sjtu.edu.cn/debian wheezy main non-free contrib
deb-src http://ftp.sjtu.edu.cn/debian wheezy main non-free contrib
deb http://ftp.sjtu.edu.cn/debian wheezy-proposed-updates main non-free contrib
deb-src http://ftp.sjtu.edu.cn/debian wheezy-proposed-updates main non-free contrib
deb http://ftp.sjtu.edu.cn/debian-security wheezy/updates main non-free contrib
deb-src http://ftp.sjtu.edu.cn/debian-security wheezy/updates main non-free contrib

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

保存之后运行：apt-get update && apt-get upgrade

下面这是Ubuntu 12.04 LTS的美国更新源（主要用于VPS上的Ubuntu系统的更新）：

# deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)]/ precise main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://us.archive.ubuntu.com/ubuntu/ precise main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ precise main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ precise-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ precise-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ precise universe
deb-src http://us.archive.ubuntu.com/ubuntu/ precise universe
deb http://us.archive.ubuntu.com/ubuntu/ precise-updates universe
deb-src http://us.archive.ubuntu.com/ubuntu/ precise-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://us.archive.ubuntu.com/ubuntu/ precise multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ precise multiverse
deb http://us.archive.ubuntu.com/ubuntu/ precise-updates multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ precise-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse

deb http://us.archive.ubuntu.com/ubuntu/ precise-security main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ precise-security main restricted
deb http://us.archive.ubuntu.com/ubuntu/ precise-security universe
deb-src http://us.archive.ubuntu.com/ubuntu/ precise-security universe
deb http://us.archive.ubuntu.com/ubuntu/ precise-security multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ precise-security multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu precise partner
# deb-src http://archive.canonical.com/ubuntu precise partner

## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu precise main
deb-src http://extras.ubuntu.com/ubuntu precise main

Update @ 2014-12-13

http://http.kali.org/kali/
http://security.kali.org/kali-security/

http://mirrors.neusoft.edu.cn/ #其实在国内，Kali的官方源用的就是东软的源

http://mirrors.ustc.edu.cn/ #中科大也维护了自己的源

http://repo.kali.org/kali/
http://repo.kali.org/kali-security/

http://mirrors.163.com/
http://mirrors.sohu.com/

==给Kali Linux安装设置VPN==

• Kali linux VPN设置(kali连接不上vpn解决办法）
• Configure Virtual Private Network (VPN) in Kali
• 安装 Kali Linux 后需要做的 20 件事
  20 things to do after installing Kali Linux