Wi-Fi Adapter Missing 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

Wireless networks disappear and device shows no Wi-Fi adapter in settings or command output.

Environment & Reproduction

Ubuntu 20.04 laptops after kernel updates, firmware changes, or RF kill toggles.

Root Cause Analysis

Required kernel module, firmware blob, or hardware radio state is unavailable at boot.

Quick Triage

Check `rfkill`, PCI/USB device detection, and whether the expected driver module is loaded.

Step-by-Step Diagnosis

Inspect `dmesg` for firmware load errors and validate module aliases for chipset ID.

Solution – Primary Fix

Install/repair firmware package, load correct module, and persist configuration across reboots.

Solution – Alternative Approaches

Use OEM kernel packages, external adapter fallback, or vendor DKMS package where applicable.

Verification & Acceptance Criteria

Wireless interface appears reliably, scans networks, and obtains stable IP connectivity.

Rollback Plan

Revert recent kernel/firmware changes if newly introduced driver stack remains unstable.

Prevention & Hardening

Track device-specific firmware dependencies and test kernel updates on representative hardware first.

Related Errors & Cross-Refs

`firmware: failed to load`, `No Wi-Fi adapter found`, and network manager radio-disabled states.

Related tutorial: View the step-by-step tutorial for Ubuntu 20.04 LTS.

View all Ubuntu 20.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Ubuntu wireless troubleshooting references and chipset-specific driver notes for 20.04.