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VirtualBox 4.1

VirtualBox 4.1 hs been released today, bringing some new GUI features like support for cloning VMs and a new wizard for copying virtual disks. Other changes:
  • Experimental support for PCI passthrough for Linux hosts
  • Enhanced wizard for creating new virtual disks
  • Raised the memory limit for 64-bit hosts to 1TB
  • Windows guests: Experimental WDDM graphics driver, supporting Windows Aero and providing Direct3D support using a cleaner approach
  • New Networking Mode UDP Tunnel: allows to interconnect VMs running on different hosts easily and transparently
  • Experimental support for SATA hard disk hotplugging available with VBoxManage

For a complete changelog, check out this page.

A bit of info on the new features so you'll know where to find them:
  • to clone a VM, simply right click it in the main VirtualBox window and select "Clone"
  • to copy a virtual disk, select File > Virtual Media Manager, right click a .vdi and select "Copy"

Install VirtualBox 4.1 in Ubuntu / Debian via repository

1. Firstly, remove VirtualBox 4.0 (if it's installed):
sudo apt-get remove virtualbox-4.0

2. Add the VirtualBox repository and install the latest VirtualBox 4.1:
echo "deb http://download.virtualbox.org/virtualbox/debian $(lsb_release -sc) contrib" | sudo tee /etc/apt/sources.list.d/virtualbox.list
wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | sudo apt-key add -
sudo apt-get update
sudo apt-get install virtualbox-4.1

3. Optional: for USB 2.0 devices, VirtualBox RDP and PXE boot for Intel cards support, you'll also have to install an Extension pack which you can download from HERE.

To install VirtualBox extension pack, double clicking the extension should be enough but if that doesn't work, open VirtualBox, go to File > Preferences and on the Extensions tab, click the "add" button on the right and browse for the VirtualBox extension pack.

For other Linux distributions, Windows and Mac OSX, see the VirtualBox download page.