Over the past 2 weeks (after installing Ubuntu 18.04 from scratch) I have had problems on and off with the Signal messenger app. It sometimes doesn't start up at all. Uninstalling and reinstalling doesn't seem to help. I think this happened after some Ubuntu updates came through. Any idea how to get Signal running again?
SnapOverflow
There was something wrong with the snap package install. I unstalled the signal snap package, then downloaded Signal from their website and installed it without any further problems.