Sebastien, it's fully reproducible. In focal - just "sudo apt install virtualbox-qt" from standard repo. Create any virtual machine and run it. Issue immediately visible.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell-extension-ubuntu-dock in Ubuntu. https://bugs.launchpad.net/bugs/1792000 Title: VirtualBox icon does not show un dock until screen locks Status in gnome-shell-extension-ubuntu-dock package in Ubuntu: Incomplete Bug description: Quite simple: I start VirtualBox or a virtual machine straight from the build directory (without installing) and the icon in the dock is a red, crossed-out circle. After deliberately or due to a timeout locking the screen and unlocking it, the correct X11 property icon is shown. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: gnome-shell-extension-ubuntu-dock 0.9.1ubuntu18.04.1 ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18 Uname: Linux 4.15.0-33-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.2 Architecture: amd64 CasperVersion: 1.394 CurrentDesktop: ubuntu:GNOME Date: Tue Sep 11 20:32:51 2018 InstallationDate: Installed on 2018-06-12 (91 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) PackageArchitecture: all SourcePackage: gnome-shell-extension-ubuntu-dock UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell-extension-ubuntu-dock/+bug/1792000/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp