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