🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026
Affected versions: Ubuntu 24.04 LTS Ubuntu 24.04 Ubuntu 24.04.1

πŸ“– ~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

Hostname lookups fail intermittently, disrupting package and service access.

Environment & Reproduction

Can appear after VPN, DHCP, or profile changes.

resolvectl query archive.ubuntu.com
ls -l /etc/resolv.conf

Root Cause Analysis

Resolver receives stale or invalid upstream DNS settings.

Quick Triage

Check resolver service state and active DNS servers.

systemctl status systemd-resolved --no-pager
resolvectl status

Step-by-Step Diagnosis

Inspect recent resolver errors and per-link DNS configuration.

journalctl -u systemd-resolved -n 80 --no-pager
resolvectl status
Illustrative mockup for ubuntu-24-04-lts β€” terminal_or_console
Diagnosis commands for post 158 β€” Illustrative mockup β€” Progressive Robot

Solution – Primary Fix

Restore correct resolv.conf symlink and restart resolver.

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sudo ln -sf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf
sudo systemctl restart systemd-resolved
Illustrative mockup for ubuntu-24-04-lts β€” log_or_dashboard
Fix validation evidence for post 158 β€” Illustrative mockup β€” Progressive Robot

Solution – Alternative Approaches

Set DNS servers explicitly via netplan for deterministic behavior.

sudo netplan get

Verification & Acceptance Criteria

Queries resolve consistently for external and internal domains.

resolvectl query ubuntu.com
getent hosts archive.ubuntu.com

Rollback Plan

Revert DNS profile changes if internal resolution breaks.

sudo systemctl restart systemd-resolved

Prevention & Hardening

Control DNS order and monitor resolver health after network changes.

resolvectl statistics

Related errors include temporary failure in name resolution and DNSSEC validation failures.

Related tutorial: View the step-by-step tutorial for Ubuntu 24.04 LTS.

View all Ubuntu 24.04 LTS tutorials on the Tutorials Hub β†’

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Ubuntu systemd-resolved and DNS operations references.

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