Ubuntu 14.04 LTS – network interface does not come up after reboot

📖 ~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

Server loses network connectivity after reboot until interface is manually brought up.

Environment & Reproduction

Observed after NIC replacement, driver updates, or interface config edits.

Root Cause Analysis

Interface naming mismatch, disabled auto-start, or driver initialization failure.

Quick Triage

Compare expected interface names with detected devices and boot logs.

Step-by-Step Diagnosis

Inspect /etc/network/interfaces, udev rules, and dmesg network events.

Solution – Primary Fix

Correct interface mapping and enable auto-start in persistent network config.

Solution – Alternative Approaches

Use temporary ifup commands while implementing permanent naming corrections.

Verification & Acceptance Criteria

Interface initializes automatically with expected IP on each reboot.

Rollback Plan

Restore prior interface files and udev mappings if connectivity regresses.

Prevention & Hardening

Version-control network configs and validate changes through reboot tests.

Related Errors & Cross-Refs

Related issues include device not found and carrier lost events.

Related tutorial: View the step-by-step tutorial for Ubuntu 14.04 LTS.

View all Ubuntu 14.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

See Ubuntu network interface and persistent naming documentation.