I was trying to update my Kali Linux with the version of 2017, and go the following error:

 

W: An error  occurred during the signature verification...…..

 

Also I got:

 

W: Failed to fetch http://.....

 

And the system was saying:

 

W: Some index files failed to download. They have been ignore....

 

 

How fix this? Run the following command:

 

wget -q -O - https://archive.kali.org/archive-key.asc  | apt-key add