Install updates works for everything else, this is a recent error for the two updates, now only for the 1.
I have added this and it produces this result, at the end after update and upgrade -
I have added this and it produces this result, at the end after update and upgrade -
Code:
W: GPG error: https://download.01.org/gfx/ubuntu/16.04/main xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 56A3DEF863961D39
W: The repository 'https://download.01.org/gfx/ubuntu/16.04/main xenial InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure( manpage for repository creation and user configuration details.