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.
Steps to access share folder and enable copy/paste between Windows computer and Ubuntu running on Oracle Virtualbox environment. You will find it so much needed to transfer files soon after you complete fresh installation of Ubuntu.
How to install Brackets, an open-source, lightweight and powerful text editor. Brackets makes the web development easy to design for web designers and front-end developers.
Try using wireshark to analyse your network traffic, you will be surprised to see many IPv6 traffic that you are not expecting in your IPv4 based network. These IPv6 packets are actually consuming your server and network resources for no use.
This article explains how to disable IPv6 in the network interface cards of Linux/CentOS servers.