When the installation of an application halts with the error “One or more PGP signatures could not be verified!” and you trust this application, you can bypass this check via the extra options –skipinteg.

You can find such information in your local “man”.

Type “man packer” in the terminal to learn more or “man yaourt”.

You can also find it online here :

Following the link this would have worked as well : –skippgpcheck

An example of an error in February 2018 when installing vmware-workstation following this article.