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Table of contents
Symptom & Impact
Headsets or keyboards are discovered but pairing repeatedly fails or disconnects shortly after connection.
Environment & Reproduction
Frequently seen after sleep cycles, stale pair records, or dual-boot device key conflicts.
Root Cause Analysis
BlueZ cache and controller state drift from device pairing expectations, causing authentication failure.
Quick Triage
Verify adapter status with bluetoothctl show and service state with systemctl status bluetooth.
Step-by-Step Diagnosis
Use bluetoothctl scan on, pair, trust and connect commands while watching logs in journalctl -u bluetooth -f.
Solution – Primary Fix
Remove stale records in bluetoothctl, restart bluetooth service, then pair again from clean state.
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Solution – Alternative Approaches
Update firmware package set and test USB Bluetooth dongle to isolate onboard adapter issues.
Verification & Acceptance Criteria
Device remains connected for extended use and auto-reconnect works after reboot.
Rollback Plan
If new kernel or firmware changes regress behavior, boot previous kernel and retest pairing.
Prevention & Hardening
Keep BlueZ and firmware current, and avoid simultaneous pairing from multiple operating systems.
Related Errors & Cross-Refs
Related lines include ‘AuthenticationFailed’ and repeated connect-disconnect loops.
Related tutorial: View the step-by-step tutorial for Ubuntu 26.04 LTS.
View all Ubuntu 26.04 LTS tutorials on the Tutorials Hub โ
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
BlueZ documentation, bluetoothctl manual, and Ubuntu desktop Bluetooth troubleshooting notes.
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