Ubuntu installation process is continuously returning back to the beginning when you setup static IP address in the network configuration. In order to overcome this problem, do not mention Search domains in the network configuration.
When you experience problem with Ubuntu virtual machine stuck on Orange screen without desktop access, you can overcome it by increasing video memory of VM.
In Oracle Virtualbox, add virtual machine copies to list of orignal VM using this trick. However best approach is cloning VMs and not copy.