π ~1 min read
Table of contents
Symptom & Impact
Video conferencing apps show black screen or no selectable monitor.
Environment & Reproduction
Observed on Wayland sessions with browser or app portal mismatch.
Root Cause Analysis
xdg-desktop-portal backend is missing or incompatible with app runtime.
Quick Triage
Check installed portal packages and process status with ps -ef | grep xdg-desktop-portal.
Step-by-Step Diagnosis
Inspect user logs with journalctl –user -u xdg-desktop-portal -u xdg-desktop-portal-gnome -n 120.
Solution – Primary Fix
Install required portals using sudo apt install xdg-desktop-portal xdg-desktop-portal-gnome, then log out and back in.
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Solution – Alternative Approaches
Use Xorg session temporarily when app-specific Wayland sharing remains unstable.
Verification & Acceptance Criteria
Screen share picker appears and remote participants see shared content.
Rollback Plan
Revert desktop portal package changes if regressions affect other apps.
Prevention & Hardening
Keep portal stack aligned with desktop updates.
Related Errors & Cross-Refs
Related: PipeWire source unavailable and denied portal permission.
Related tutorial: View the step-by-step tutorial for Ubuntu 24.04 LTS.
View all Ubuntu 24.04 LTS tutorials on the Tutorials Hub β
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
GNOME portal documentation and Ubuntu desktop notes.
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