我全新安装了 Ubuntu 18.04，我安装了 Slack，但它在托盘指示器中没有显示任何图标：
? snap info slack
name: slack
summary: Team communication for the 21st century.
publisher: slack
contact: https://get.slack.help/hc/en-us
license: unknown
description: |
Caution: Slack for Linux is in beta. We’re still busy adding features and
ironing out potential issues.
Slack brings team communication and collaboration into one place so you can
get more work done, whether you belong to a large enterprise or a small
business. Check off your to-do list and move your projects forward by …