(solved) apt security

[naibed]

I apologize if this topic has been covered numerous times.

When trying to install various packages, from backports presumably, I am getting the message, The following package cannot be authenticated!

I have tried to add the keyring by installing

Code: Select all

 apt-get install debian-backports-keyring

and

 wget -O - http://backports.org/debian/archive.key | apt-key add -

however I am still getting warned by apt. What am I doing wrong?

[nadir]

i think you missed to run
apt-get update
again to let the package-management know about the new keyring.
i do it like this:
apt-get install *keyring*
getting told that it ain't trusted and accept with y(es)
apt-get update
install my packages

[naibed]

many thanks