Infrastructure Software

Solution to this problem has been found:
I accidentally found the solution to the above problem while I am trying to setup and configure the auto restart of virtual machines in Oracle Linux. Here are the steps I followed:
[These steps were described also at https://kifarunix.com/autostart-virtualbox-vms-on-system-boot-on-linux/. Thanks to koromicha for sharing this on the www.]
Configure VirtualBox Autostart Service
In order to configure a VirtualBox VM to start on system boot on Linux, you need to activate the autostart service. The autostart service can be activated by setting two variables in /etc/default/virtualbox;
VBOXAUTOSTART_DB – which defines the absolute path to the autostart database directory, usually the /etc/vbox.
VBOXAUTOSTART_CONFIG – defines the path to the virtual machine autostart configuration.
These variables can be defined as;

VBOXAUTOSTART_DB=/etc/vbox
VBOXAUTOSTART_CONFIG=/etc/vbox/autostartvm.cfg

To place these variables in the /etc/default/virtualbox, run the command below;

echo -e "VBOXAUTOSTART_DB=/etc/vbox\nVBOXAUTOSTART_CONFIG=/etc/vbox/autostartvm.cfg" | sudo tee /etc/default/virtualbox

Define the virtual machine autostart configuration settings. The autostart configuration file contains options that controls how the virtual machine is auto started.

vim /etc/vbox/autostartvm.cfg
default_policy = deny

vmuser = {
    allow = true
    startup_delay = 10
}

default_policy – defines whether to allow or deny the virtual machine autostart by default. In our example above, we denied any one from auto-starting the VM and explicitly allow one user, amos.
username (vmuser) – with the default deny policy, you can define the specific users that are allowed to autostart the virtual machine (allow = true). You can also define how long to delay the VM startup. 10 seconds is used in this demo.
Set Ownership of Database directory
The database directory, /etc/vbox, should be writable by the user to be used to start VMs automatically. To make it easy, you can simply add your user to vboxusers group and set the group ownership of the database directory to vboxusers group. After that, set the write permissions for the group. In this case, amos user is to be used to automatically start the virtual machine.

sudo usermod -aG vboxusers vmuser
sudo chgrp vboxusers /etc/vbox

Assign the group write permissions on the autostart database directory.

sudo chmod g+w /etc/vbox

To shield the directory from being modified or deleted by other users except the owner or the root user, set sticky bit.

sudo chmod +t /etc/vbox

Enable Virtual Machine Autostart
As a user, you can enable autostart for individual machines. This requires that you define the path to the database directory first.

VBoxManage setproperty autostartdbpath /etc/vbox/

This step gave the following error:

WARNING: The vboxdrv kernel module is not loaded. Either there is no module
         available for the current kernel (5.4.17-2102.200.13.el7uek.x86_64) or it failed to
         load. Please recompile the kernel module and install it by

         sudo /sbin/vboxconfig

         You will not be able to start VMs until this problem is fixed

To fix this error: I simple ran the above command and restarted the OS becuase there is a recompilation of kernel module.

sudo /sbin/vboxconfig
systemctl reboot 

Once that is done, you can now setup the virtual machine to automatically start on system boot. At the same time, it has also fixed the problem that I reported.

vboxmanage modifyvm OracleLinux77 --autostart-enabled on

Where OracleLinux77 is the UUID or the name of your virtual machine.
Restart vboxautostart-service
The configuration is now done. To effect the settings, you need to restart the vboxautostart-service.

sudo systemctl restart vboxautostart-service

Testing the Virtual Machine autostart
To test that your virtual machine can actually autostart on system boot, reboot you system and check. When system boots, your VM should now be running.
If you which to disable the virtual machine autostart;

vboxmanage modifyvm OracleLinux77 --autostart-enabled off

That is all on how to autostart VirtualBox VMs on system boot on Linux and also to fix the crash with Virtual Box. Feel free to drop any comment. Enjoy.