📖 ~1 min read
Table of contents
Symptom & Impact
On Ubuntu 22.04, Wi-Fi may disconnect after resume or fail to reconnect automatically.
Environment & Reproduction
The wireless icon shows no internet, DNS fails, or the SSID does not reconnect after sleep.
Root Cause Analysis
Common causes include unstable driver power saving, router channel issues, or stale NetworkManager state.
Quick Triage
Confirm airplane mode is off, verify the correct SSID, and test with another network if available.
Step-by-Step Diagnosis
Run nmcli device status, rfkill list, ip a, and journalctl -u NetworkManager –since -30m.
Solution – Primary Fix
Restart NetworkManager with sudo systemctl restart NetworkManager, forget and re-add the SSID, then disable problematic power saving.
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Solution – Alternative Approaches
Ping the gateway and a public DNS target, then verify stable reconnect after suspend and resume cycles.
Verification & Acceptance Criteria
Keep linux-firmware updated and avoid aggressive Wi-Fi power management on unstable adapters.
Rollback Plan
Use WPA2 or WPA3 and remove obsolete saved networks from your Ubuntu connection list.
Prevention & Hardening
Prefer 5 GHz channels with low interference and use modern router firmware where possible.
Related Errors & Cross-Refs
Revert NetworkManager config edits and restore default connection profile settings if regressions appear.
Related tutorial: View the step-by-step tutorial for Ubuntu 22.04 LTS.
View all Ubuntu 22.04 LTS tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Use man nmcli, man NetworkManager.conf, and Ubuntu 22.04 networking documentation.
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