BT5后都需要进行一次更新。
首先，打开终端输入命令：
gedit /etc/apt/sources.list
也可以通过文件夹打开，路径与上面是一致的。
然后添加更新源地址：
deb http://all.repository.backtrack-linux.org revolution main microverse non-free testing
deb http://32.repository.backtrack-linux.org revolution main microverse non-free testing
deb http://source.repository.backtrack-linux.org revolution main microverse non-free testing
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以上是自带的，以下是网上找的。还好都是存在的网址，不存在的已经剔除掉了
deb http://mirrors.163.com/ubuntu/ lucid main universe restricted multiverse
deb-src http://mirrors.163.com/ubuntu/ lucid main universe restricted multiverse
deb http://mirrors.163.com/ubuntu/ lucid-security universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ lucid-security universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ lucid-updates universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ lucid-updates universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ lucid-proposed universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ lucid-proposed universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ lucid-backports universe main multiverse restricted
deb http://mirror.edu.backtrack-linux.cn/backtrack/32/ revolution main microverse non-free testing
deb http://mirror.edu.backtrack-linux.cn/backtrack/all/ revolution main microverse non-free testing
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
deb http://cn.archive.ubuntu.com/ubuntu/ lucid main universe restricted multiverse
deb http://security.ubuntu.com/ubuntu/ lucid-security universe main multiverse restricted
deb http://cn.archive.ubuntu.com/ubuntu/ lucid-updates universe main multiverse restricted
deb http://updates.repository.backtrack-linux.org revolution main microverse non-free testing
