For a while I had struggled with installing Linux on Oracle VM and it always fails at some point during the installation.
What I did
I updated my VM and downloaded the Kali light version, then installed it and followed the steps carefully. It worked!!
What went wrong
After installation, login failed. I had to create another VHD to install a fresh version of Kali, only to find out that the username is simply "root" without the quotes and use the password you setup, capische!,..
Let pen testing practice begin!!