Recently I had a lot of GPG errors with the following message
W: GPG error: http://ppa.launchpad.net trusty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY *****************
I removed them with using What is the easiest way to resolve apt-get BADSIG GPG errors? and with the help from other sites. But now every time I add new PPA and try to update I got the GPG Error for the last added PPA.
Using Y-PPA > Advanced > Try to import all missing GPG keys removes the error/s but it will show again for every new PPA added. Can someone tell me why I got GPG error every time and how to fix it permanently.
using Ubuntu 14.04 x64 EDIT: Problem solved. I was missing /etc/apt/trusted.gpg.d