How to solve GPG warning about apt/aptitude repository update
When you add a repository in your /etc/apt/sources.list and run a apt-update you'll get the update of the newly added repository but also a warning about a GPG key like the following one : Hit http://ppa.launchpad.net intrepid/main Sources Hit http://fr.archive.ubuntu.com intrepid-proposed/universe Packages Hit http://ppa.launchpad.net intrepid/main Packages Fetched 309B in 0s (519B/s) Reading package lists... Done W: GPG error: http://ppa.launchpad.net intrepid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D702BF6B8C6C1EFD W: You may want to run apt-get update to correct these problems Running again apt-update won't solve the issue. This warning can be safely ignored, but I don't like to leave warning when there is a solution to get rid of it... because when something is going wrong, it would complicate to sort out what is safe to be ignored and what tells about a real issue. So, to get rid of this warning her...