在學習使用Kali Linux的過程中，由於新版Kali Linux 不再自帶 BeEF，所以打算用apt-get install 安裝一個 BeEF，即命令行輸入：
sudo apt-get install beef-xss
然而會報錯：E: Unable to locate package beef-xss
這是因為我們的Kali Linux中當前的apt資源列表中找不到該包。
解決辦法，更改apt的資源列表。
1. 編輯 /etc/apt/sources.list文件：
sudo vim /etc/apt/sources.list
2. 添加舊的資源信息：
deb http://http.kali.org/kali kali-rolling main contrib non-free # For source package access, uncomment the following line # deb-src http://http.kali.org/kali kali-rolling main contrib non-free deb http://http.kali.org/kali sana main non-free contrib deb http://security.kali.org/kali-security sana/updates main contrib non-free # For source package access, uncomment the following line # deb-src http://http.kali.org/kali sana main non-free contrib # deb-src http://security.kali.org/kali-security sana/updates main contrib non-free deb http://old.kali.org/kali moto main non-free contrib # For source package access, uncomment the following line # deb-src http://old.kali.org/kali moto main non-free contrib
3. 更新資源列表：
sudo apt-get update
更新完畢后重新安裝目標應用即可。