When updating apt on Ubuntu server, i get following error
root@ip-172-31-25-25:/home/ubuntu# apt-get update Hit:1 http://ap-south-1.ec2.archive.ubuntu.com/ubuntu xenial InRelease Hit:2 http://ap-south-1.ec2.archive.ubuntu.com/ubuntu xenial-updates InRelease Hit:3 http://ap-south-1.ec2.archive.ubuntu.com/ubuntu xenial-backports InRelease Ign:4 http://nightly.odoo.com/9.0/nightly/deb ./ InRelease Get:5 http://nightly.odoo.com/9.0/nightly/deb ./ Release [1186 B] Get:6 http://nightly.odoo.com/9.0/nightly/deb ./ Release.gpg [819 B] Ign:6 http://nightly.odoo.com/9.0/nightly/deb ./ Release.gpg Get:7 http://nightly.odoo.com/9.0/nightly/deb ./ Packages [1790 B] Hit:8 http://security.ubuntu.com/ubuntu xenial-security InRelease Fetched 3795 B in 2s (1736 B/s) Reading package lists... Done W: GPG error: http://nightly.odoo.com/9.0/nightly/deb ./ Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY DEF2A2198183CBB5 W: The repository 'http://nightly.odoo.com/9.0/nightly/deb ./ Release' is not signed. 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. root@ip-172-31-25-25:/home/ubuntu#
To fix, run
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys DEF2A2198183CBB5
