A possible workaround is described at https://askubuntu.com/a/1042998/68491 :
> restart GNOME shell by typing Alt+f2, then typing r and pressing Enter -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell-extension-appindicator in Ubuntu. https://bugs.launchpad.net/bugs/1740600 Title: Certain app indicators dissappear after laptop hibernates Status in gnome-shell-extension-appindicator package in Ubuntu: Confirmed Bug description: Particularly the application indicators for Skype and Slack disappear after my laptop hibernates. There does not appear to be anyway to bring them back unless I restart the computer. ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: gnome-shell-extension-appindicator 17.10.3 ProcVersionSignature: Ubuntu 4.13.0-21.24-generic 4.13.13 Uname: Linux 4.13.0-21-generic x86_64 ApportVersion: 2.20.7-0ubuntu3.6 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Sat Dec 30 10:38:57 2017 Dependencies: InstallationDate: Installed on 2017-10-11 (80 days ago) InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412) PackageArchitecture: all SourcePackage: gnome-shell-extension-appindicator UpgradeStatus: Upgraded to artful on 2017-11-09 (50 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell-extension-appindicator/+bug/1740600/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
