📖 ~1 min read
Table of contents
Symptom & Impact
Applications play media but no audible output reaches speakers or connected headsets on Ubuntu 16.04.
Environment & Reproduction
The issue affects system alerts, browser playback, and conferencing tools across different user sessions.
Root Cause Analysis
Likely causes include wrong output sink selection, muted channels, or PulseAudio profile mismatches.
Quick Triage
Check volume levels, verify selected output device, and test a known-good headset or speaker.
Step-by-Step Diagnosis
List playback sinks, inspect mixer channels, and review audio service state to pinpoint routing failures.
Solution – Primary Fix
Set the correct default sink, unmute channels, and restart user audio services to restore playback.
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Solution – Alternative Approaches
Disable conflicting HDMI output profiles and retest using desktop audio settings and command-line tools.
Verification & Acceptance Criteria
Audio works consistently for local media, browser content, and system notifications after reboot.
Rollback Plan
Revert custom ALSA or PulseAudio configuration changes and return to baseline package versions.
Prevention & Hardening
Maintain kernel and firmware updates and avoid unsupported replacement audio stacks.
Related Errors & Cross-Refs
Related issues include microphone capture failure, Bluetooth profile switching, and HDMI auto-routing.
Related tutorial: View the step-by-step tutorial for Ubuntu 16.04 LTS.
View all Ubuntu 16.04 LTS tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Use Ubuntu audio troubleshooting resources and PulseAudio command documentation for deeper diagnostics.
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