Start the Virtual Machine - You will reach the grub screen which looks like this
You will be presented with available kernels and their recovery modes similar to this graphic
Scroll down to the second option that is the recovery option and hit enter. You will have a verbose boot sequence that looks like this
Resume the normal boot - You will get a recovery boot menu. This has many options that allow you to tweak different settings but for this exercise you will simply resume a normal boot
When you hit enter on resume, you have an additional dialog like the one shown below that tells you that you are leaving recovery mode and resuming a normal boot.
Normal Boot - Although you have chosen normal boot you will still have a verbose (command line) boot
When that finishes it will initialize the login screen (lightdm) and you can login as you normally would
Install Virtual Box Guest additions - You next step will be to install the VirtualBox guest additions. This will allow you to get proper screen resolutions and additional hardware resources.
Currently this procedure works for:
Black Lab Enterprise Linux
Black Lab Enterprise Linux for Eduction
Black Lab Studio
Black Lab Embedded
Black Lab Server