VirtualBox 是一款功能强大的 x86 和 AMD64/Intel64 虚拟化产品，免费提供为企业和家庭使用。VirtualBox 是一款为企业客户提供丰富，且高性能的产品，它也是唯一的专业的免费提供的虚拟化解决方案，这是一款开源软件按照 GNU 通用公共许可证（GPL）版本2的条款发布。 virtualbox 4.3.6 新变化： - VMM: fixed a Guru Meditation VINF_EM_TRIPLE_FAULT caused by VMCB caching with nested paging on certain AMD CPUs (bug #12451)
- VMM: fixed a Guru Meditation VERR_VMX_UNEXPECTED_INTERRUPTION_EXIT_TYPE while intercepting debug exceptions (VT-x only; bug #12410)
- VMM: fixed a Guru Meditation VERR_SVM_UNEXPECTED_EXIT while intercepting debug register accesses (AMD-V only; bug #12481)
- VMM: fixed a VERR_SSM_STRUCTURE_MAGIC error when trying to load a saved state made with VBox 4.3.4 when VT-x/AMD-V is disabled. Unfortunately, VBox 4.3.4 produced broken saved states for this configuration so you have to discard these states (bug #12414)
- VMM: added a few more MSRs to the whitelist required by certain guests (bug #12245)
- GUI: fixed deleting of inaccessible VMs (4.3 regression, bug #12205)
- GUI: fixed warnings in VM settings / number of guest processors (bug #12480)
- Main: don’t automatically enable 64-bit guests on 64-bit hosts if VT-x/AMD-V is not available (bug #12424)
- Main: always expose the DMI memory information to Windows 2012 guests (bug #12017)
- Main: fixed occasional crashes on guest display resolution change (bug #7063)
- Main: fixed reporting back temporary name when calling IGuestSession::DirectoryCreateTemp() (bug #12498)
- API: fix for a hang when launching a GUI VM through the API, which crashes due to GUI unavailability
- Storage: fix for BLKCACHE_IOERR runtime errors under rare circumstances (bug #11030)
- Network: allow to start more than 5 PCNet instances (bug #12426)
- E1000: if the cable was disconnected before the guest initialized the device, the link status was not properly set to ‘down’ after the initialization completed despite the fact that there was no connection
- 3D support: fixed offset of guest 3D image elements (Mac OS X Retina hosts only; bug #11021)
- Solaris hosts: fixed accessing the host driver from non-global zones (4.3 regression, bug #12271)
安装方法: 在 ubuntu 13.10/13.04/12.10 上安装，完全使用命令，打开终端：
首先添加编辑 /etc/apt/sources.list 源列表： gksudo gedit /etc/apt/sources.list
添加下面地址：
（ubuntu 13.10 用户添加下面这行）
deb http://download.virtualbox.org/virtualbox/debian saucy contrib （ubuntu 13.04 用户添加下面这行） deb http://download.virtualbox.org/virtualbox/debian raring contrib
（ubuntu 12.10 用户添加下面这行） deb http://download.virtualbox.org/virtualbox/debian quantal contrib
（ubuntu 12.04 用户添加下面这行） deb http://download.virtualbox.org/virtualbox/debian precise contrib
保存并退出。 安装 PGP key 使用下面的命令： wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | sudo apt-key add -
更新源列表 sudo apt-get update
安装 virtualbox sudo apt-get install virtualbox-4.3
如果遇到安装问题，你可以下载 .deb 安装包，然后双击安装！ | 
