Using VirtualBox 6.0. Host Windows 10 Pro, VM: Linux Ubuntu 64 18.04.2. I’m quite a beginner with Linux and haven’t used Virtual Box for years.
I was initially trying to set the resolution for my VM, but got into even worst problems. So, trying to solve one at a time…
I first launched the VM with Ubuntu .iso as virtual drive, installed Ubuntu. Ejected Ubuntu installation virtual disc. Then I inserted the Guest Additions virtual CD ( Devices > Insert Guest Additions CD image … ) Linux told me that this CD has executable content, I told it to run it. All I get then is a black screen.
After a long time, I tried ACPI shutdown and re-started the machine.
I see a Ubuntu loading screen (“Ubuntu” title with 4 dotes below it) then after a short time, a black screen. (Doesn’t seem perfectly black though, it looks like the black with a tiny bit of red used in some Ubuntu screens).