🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026
Affected versions: RHEL 10

📖 ~1 min read

Table of contents
  1. Symptom & Impact
  2. Environment & Reproduction
  3. Root Cause Analysis
  4. Quick Triage
  5. Step-by-Step Diagnosis
  6. Solution – Primary Fix
  7. Solution – Alternative Approaches
  8. Verification & Acceptance Criteria
  9. Rollback Plan
  10. Prevention & Hardening
  11. Related Errors & Cross-Refs
  12. References & Further Reading

Symptom & Impact

DNF blocks package installation with signature verification errors, delaying patching and deployments.

Environment & Reproduction

Seen when adding third-party or internal repos without proper `gpgkey` setup.

dnf install -y mypackage
dnf repolist -v
rpm -qa gpg-pubkey*

Root Cause Analysis

Repository metadata references a signing key not imported or mismatched with package signatures.

Quick Triage

Identify failing repository and expected key URL.

grep -R '^gpgkey=' /etc/yum.repos.d
dnf -v install mypackage 2>&1 | tail -n 80
journalctl -n 30 --no-pager

Step-by-Step Diagnosis

Verify key fingerprint and repo policy.

rpm -qi gpg-pubkey*
curl -fsSL https://repo.example.com/RPM-GPG-KEY-example | gpg --show-keys --fingerprint
cat /etc/yum.repos.d/example.repo
Illustrative mockup for rhel-10 — terminal_or_shell
Reviewing GPG key verification failures — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Import trusted key and ensure repo enforces signature checks.

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sudo rpm --import https://repo.example.com/RPM-GPG-KEY-example
sudo dnf clean all
sudo dnf makecache
sudo dnf install -y mypackage
Illustrative mockup for rhel-10 — log_or_config
Importing correct repository signing key — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Distribute key via config management and pin fingerprint validation in CI.

sudo install -m 0644 /tmp/RPM-GPG-KEY-example /etc/pki/rpm-gpg/
sudo sed -i 's#^gpgkey=.*#gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-example#' /etc/yum.repos.d/example.repo

Verification & Acceptance Criteria

Package installs cleanly with valid signature checks enabled.

dnf install -y mypackage
rpm -q mypackage
rpm -qi gpg-pubkey* | head -n 40

Rollback Plan

Remove wrong key and revert repo file if accidental trust was introduced.

sudo rpm -e gpg-pubkey-
sudo dnf clean all

Prevention & Hardening

Never disable `gpgcheck`; automate trusted key lifecycle and fingerprint reviews.

grep -R '^gpgcheck=' /etc/yum.repos.d
dnf repolist

Related to TLS interception certificates, mirror tampering alerts, and expired repository metadata.

Related tutorial: View the step-by-step tutorial for rhel-10.

View all rhel-10 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

RHEL package signing and repository security documentation.

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