W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_damien-moore_codeblocks-stable_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 993D634ED0E1A56F786F5B8F87BB07B4C99E40E1 (weak digest)
W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_rebuntu16_avidemux+unofficial_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 1DB97831F2CB20F9DB8FFDE9191A0DD498F78EB3 (weak digest)
W: The repository 'http://ppa.launchpad.net/c.falco/mame/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: gpgv:/var/lib/apt/lists/panthema.net_repo_debian_dists_squeeze_Release.gpg: The repository is insufficiently signed by key 1A0CC16F04D7CE0E03775095B7B702B5F4EF04FA (weak digest)