When an administrator installed a custom keyring under /etc, signature verification selected it instead of the vendor keyring under /usr. That could make vendor-signed system updates stop verifying after adding local keys. Collect all readable default keyrings, including the current and legacy /etc paths, and pass temporary copies to GnuPG with separate --keyring options. Keep SYSTEMD_OPENPGP_KEYRING as an explicit override, add regression coverage for keyring coexistence, override behavior, and current-path signing, and silence the expected shellcheck false positive in the test cleanup helper. Closes: #40702
System and Service Manager
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