Hello, Looks like xenial apt repos one key is broken. After apt update:
W: GPG error: http://apt.puppetlabs.com xenial Release: The following signatures were invalid: BADSIG 7F438280EF8D349F Puppet, Inc. Release Key (Puppet, Inc. Release Key) <rele...@puppet.com> E: The repository 'http://apt.puppetlabs.com xenial Release' is not signed. -- You received this message because you are subscribed to the Google Groups "Puppet Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to puppet-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/puppet-users/b5d8a843-1506-4a63-9d92-af79dfbf4d20%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.