Easiest way to install a Linux Desktop installtion on VirtualBox

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http://unix.stackexchange.com – I need a Linux Virtual machine (running on Windows with Virtual Box), and I need it run a desktop such as Gnome. Because it is running on a Virtual machine on a not particulary powerful machine I require a version of Linux which is not too memory/cpu hungry. I readup a little on this and decided to try Arch Linux as it advertised itself as lightweight and easy, but unfortunately it was not easy enough for me. I setup a VirtualBox machine mounted the Installation ISO okay as described at https://wiki.archlinux.org/index.php/Installing_Arch_Linux_from_VirtualBox But then when it came to act (HowTos)