id summary reporter owner description type status component version resolution keywords cc guest host 19589 Black screen after GUI login on Ubuntu with tools installed. MattF gombara "Hi I'm running on virutalbox (6.1.6r137129) on Windows 10 and I have installed an Ubuntu 20.04 guest on the host. I have then installed the virtualbox guest additions on the guest. The problem I have is that after bootup, the login window is displayed and I log in but then the screen goes totally black. If I then resize the window, the desktop appears I'm not sure if this is a bug in virtualbox / guest additions or some sort of conflict with Ubuntu. I have tried this multiple times installing new version of Ubuntu and each time the problem re-occurs so for me it is repeatable. Steps to reproduce: 1. Install Ubuntu 20.04 Guest OS (I gave it 128MB video memory, VMSVGA video, 3D acceleration enabled 2. Boot guest OS 3. Install guest additions (you'll need ""build-essential"" package installed too) 4. Reboot 5. Set guest to start up in full screen mode. 6. Login 7. Re-size guest window. " defect assigned guest additions/x11/graphics VirtualBox 6.1.6 Linux Windows