I had @signalapp and the #Signal Beta on #PopOS :popos: at the same time. I've been seeing "xenial" duplicates when pushing "sudo apt update." I purged the beta and still saw the duplicate notifications. If you're having issues getting rid of it, here's what I did: • Uninstall Signal. • Then in terminal: sudo /bin/rm -v /etc/apt/sources.list.d/signal-xenial.list :idle: • Reinstall Signal. I hope this helps. :signal: