需要重启一下
##使用 sudo
sudo apt-get install dsniff
###更换源
sudo vim /etc/apt/sources.list
添加这两句
deb https://mirrors.aliyun.co睿共享 m/kali kali-rolling main non-free contrib
deb-睿共享 src https:/睿共享 /mirrors.aliyun.com/kali kali-rolli睿共享 ng main n睿共享 on-free contrib