Ubuntu 20.04 no sound output on speakers or headset

📖 ~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

Audio playback appears active, but no sound is heard from expected output devices.

Environment & Reproduction

System sounds, media playback, and browser audio remain silent in Ubuntu 20.04.

Root Cause Analysis

Wrong output sink, muted channels, HDMI auto-selection, or PulseAudio profile mismatch.

Quick Triage

Check output device selection, unmute controls, and verify headset or speaker hardware.

Step-by-Step Diagnosis

Run pactl list short sinks, aplay -l, alsamixer, and inspect user audio service status.

Solution – Primary Fix

Set the correct sink, unmute channels, reload PulseAudio, and test with known audio files.

Solution – Alternative Approaches

Switch profiles in pavucontrol, disable conflicting HDMI outputs, and retest app audio routing.

Verification & Acceptance Criteria

Audio works reliably for system alerts, browser media, and conferencing applications.

Rollback Plan

Revert custom PulseAudio or ALSA config changes and restore default package versions.

Prevention & Hardening

Keep kernel and firmware current and avoid unsupported third-party audio stack replacements.

Related Errors & Cross-Refs

May overlap with Bluetooth audio glitches, HDMI sink issues, and microphone device conflicts.

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

Use Ubuntu audio troubleshooting docs and PulseAudio command references for deeper diagnostics.