My Slack calls do not work. I can conduct the call and the "connecting" pop up simply stays as connecting and my partner never connects with me (i.e. the circle progress animation never stops spinning). This is the same regardless of whether I make the call or she makes the call. And unlike this unanswered question with the same issue, the issue persists even on Chromium.
slack --version
2.8.1
lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.3 LTS
Release: 16.04
Codename: xenial