Signal Desktop doesn't start in tray on Ubuntu 17.10

gistfile1.txt

yname@my-computer:~$ signal-desktop-beta --start-in-tray
Gtk-Message: Failed to load module "overlay-scrollbar"
Gtk-Message: Failed to load module "overlay-scrollbar"
Gtk-Message: Failed to load module "overlay-scrollbar"
Gtk-Message: Failed to load module "overlay-scrollbar"
NODE_ENV production
NODE_CONFIG_DIR /opt/Signal Beta/resources/app.asar/config
NODE_CONFIG {}
ALLOW_CONFIG_MUTATIONS undefined
HOSTNAME undefined
NODE_APP_INSTANCE undefined
SUPPRESS_NO_CONFIG_WARNING undefined
setting AUMID to org.whispersystems.signal-desktop-beta
userData: /home//.config/Signal Beta
making app single instance
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"OS Release: 4.13.0-17-generic - notifications polyfill? false","time":"2017-12-07T09:18:46.024Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"app ready","time":"2017-12-07T09:18:46.069Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"Initializing BrowserWindow config: {\"show\":false,\"width\":1075,\"height\":788,\"minWidth\":700,\"minHeight\":360,\"autoHideMenuBar\":false,\"webPreferences\":{\"nodeIntegration\":false,\"preload\":\"/opt/Signal Beta/resources/app.asar/preload.js\"},\"icon\":\"/opt/Signal Beta/resources/app.asar/images/icon_256.png\",\"maximized\":false,\"x\":248,\"y\":43}","time":"2017-12-07T09:18:46.085Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"Detected Linux. Using default en_US spell check dictionary","time":"2017-12-07T09:18:46.815Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"pre-main prep time: 3 ms","time":"2017-12-07T09:18:47.053Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"Build expires:  2018-03-06T22:28:57.000Z","time":"2017-12-07T09:18:47.084Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"background page reloaded","time":"2017-12-07T09:18:47.108Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"environment: production","time":"2017-12-07T09:18:47.109Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"ConversationController: starting initial fetch","time":"2017-12-07T09:18:47.205Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"ConversationController: done with initial fetch","time":"2017-12-07T09:18:47.254Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"listening for registration events","time":"2017-12-07T09:18:47.256Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"Next signed key rotation scheduled for \"2017-12-09T05:33:41.934Z\"","time":"2017-12-07T09:18:47.259Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"connect","time":"2017-12-07T09:18:47.259Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"getAllFromCache","time":"2017-12-07T09:18:47.260Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"opening message socket https://textsecure-service.whispersystems.org","time":"2017-12-07T09:18:47.261Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"open inbox","time":"2017-12-07T09:18:47.273Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"getAllFromCache loaded 0 saved envelopes","time":"2017-12-07T09:18:47.449Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"websocket open","time":"2017-12-07T09:18:48.005Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"got request PUT /api/v1/queue/empty","time":"2017-12-07T09:18:48.010Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"MessageReceiver: emitting 'empty' event","time":"2017-12-07T09:18:48.014Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"updating notifications - count: 0 focused:  enabled: true","time":"2017-12-07T09:18:48.015Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"Sending a keepalive message","time":"2017-12-07T09:19:43.015Z","v":0}
{"name":"log","hostname":"my-computer","pid":7560,"level":30,"msg":"Sending a keepalive message","time":"2017-12-07T09:20:38.154Z","v":0}