Ubuntu 18.04 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 audible output is heard.

Environment & Reproduction

System sounds and media remain silent on internal or external output devices.

Root Cause Analysis

Wrong sink selection, muted channels, HDMI auto-routing, or PulseAudio profile mismatches are common.

Quick Triage

Check output device selection, verify volume levels, and test another headset or speaker.

Step-by-Step Diagnosis

Run pactl list short sinks, aplay -l, alsamixer, and inspect pulseaudio service logs.

Solution – Primary Fix

Set correct default sink, unmute channels, restart PulseAudio, and retest known media files.

Solution – Alternative Approaches

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

Verification & Acceptance Criteria

Audio works consistently across browser, media player, and system alert playback.

Rollback Plan

Revert custom ALSA or PulseAudio edits and restore default package versions.

Prevention & Hardening

Keep kernel and firmware current and avoid unsupported audio stack replacements.

Related Errors & Cross-Refs

May coincide with Bluetooth profile switching and HDMI detection issues.

Related tutorial: View the step-by-step tutorial for Ubuntu 18.04 LTS.

View all Ubuntu 18.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Use Ubuntu audio troubleshooting and PulseAudio command references.