Error when update apt-get to add backtrack repository

Question

i have signature error when i want to add backtrack repositories to my Ubuntu 13.10 by apt-get update after adding repositories to this file /etc/apt/source.list what shall i do to solve it? error:

http://32.repository.backtrack-linux.org revolution Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY AB6DA34B475A6B7F

help me please ...

Answer 1

I find this way to solve this problem.

command:

wget -q http://all.repository.backtrack-linux.org/backtrack.gpg -O- | sudo apt-key add -

Answer 2

Try to do that

 sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys AB6DA34B475A6B7F

And do the apt-get update again.