W: GPG error: http://dl.google.com/linux/chrome/deb stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 78BD65473CB3BD13
E: The repository 'http://dl.google.com/linux/chrome/deb stable InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: https://linux.teamviewer.com/deb stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY C5E224500C1289C0
E: The repository 'https://linux.teamviewer.com/deb stable InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://apt.postgresql.org/pub/repos/apt bionic-pgdg InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7FCC7D46ACCC4CF8
E: The repository 'http://apt.postgresql.org/pub/repos/apt bionic-pgdg InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: https://packagecloud.io/AtomEditor/atom/any any InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4C6E74D6C0A35108
E: The repository 'https://packagecloud.io/AtomEditor/atom/any any InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: https://packagecloud.io/slacktechnologies/slack/debian jessie InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY C6ABDCF64DB9A0B2
E: The repository 'https://packagecloud.io/slacktechnologies/slack/debian jessie InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.