kali is not installed arpspoof and "E: Unable to locate package problems", GPG error: because the public key can not be verified following signature: NO_PUBKEY ....

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1. I just installed kali system, using arpspoof command displays no such command

In this case needs to be installed, then down Baidu results:

apt-get install dsniff ssldump

2. However, there will be: "E: Unable to locate package Issues"

So the solution Baidu is the big brother: Update: source.list documents related to Ubuntu is the address of the source server software update, the default for Ubuntu official address, in order to improve the speed at which we can modify other server address

cd /etc/apt/
sudo cp sources.list sources.list.bb
sudo vi sources.list

But there will be errors:

Tried many addresses, the last success are:

dev http://archive.ubuntu.com/ubuntu/ trusty main universe restricted multiverse

Save and exit, in a terminal type:

sudo apt-get update

3. General here should have been a success, but I have the following questions:

Here Insert Picture Description

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 40976EAF437D058B5
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3B4FE6ACC0B21F32

Note: The final code to be replaced according to the code of your problems

Results:
then enter:

sudo apt-get update

result:

Then install it again:

apt-get install dsniff ssldump

At this point it's done:

see:

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