I have VirtualBox with two working virtual machines(VM): Windows and Linux Mint. I created new VM for the latest Linux Mint 19.3 which was installed successfully but after reboot the screen was black. No matter of changing or resizing the window. I decided to install the older working version and see if the problem is solved. But again - successful install followed by black screen after boot

Install Linux Mint 19 in VirtualBox – Linux Hint Installing Linux Mint Boot the system and since there is no startup disk, VirtualBox would insist that you provide it one. Use the Linux Mint ISO for this and start the VM. Inside the live install media we can see the Install Linux Mint utility. Install VirtualBox Guest Additions in Linux Mint Step by Jul 31, 2019

I have VirtualBox with two working virtual machines(VM): Windows and Linux Mint. I created new VM for the latest Linux Mint 19.3 which was installed successfully but after reboot the screen was black. No matter of changing or resizing the window. I decided to install the older working version and see if the problem is solved. But again - successful install followed by black screen after boot

Install Linux Mint using Oracle VM VirtualBox on Ubuntu 18 Mar 06, 2020

Jul 11, 2020

Linux Mint 20 Xfce Release Notes - Linux Mint