Why does yum/up2date fail with errors like missing GPG key, GPG key is missing, and Public key for PACKAGE is not installed?

Solution Verified - Updated -

Issue

  • Why does yum fail with "GPG key is missing" error?
  • Why does up2date fail with "missing GPG key" error?
  • Why does yum or rpm print a "rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key" warning?

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 4

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