VirtualBox是一款强大的x86和AMD64/Intel64的虚拟化软件产品，为企业和家庭免费提供使用，VirtualBox不仅拥有极其丰富的功能，而且是一款高性能的虚拟软件产品，为企业客户提供专业解决方案，作为开源软件它是免费提供的，使用GNU通用公共许可。

新版本变化：
这是一个维护版本，以下是改变:

VMM: don’t inject stale VT-x events to prevent crashes after VM reset (bug #11256)
VMM: workaround for buggy BIOSes which enable MONITOR only for certain CPUs (bugs #9460, #10686)
GUI: fixed trimming of anti-aliased text in details-view element headers (4.2.0 regression)
GUI: fixed create-settings-file-alias functionality on Mac hosts (4.2.0 regression)
GUI: fixed take-guest-screenshot functionality on Windows hosts (bug #11095)
GUI: several minor fixes, including palette fixes (bug #11191)
GUI: fixed Windows 2012 OS type (bug #11206)
GUI: allow to terminate the VM even if VBoxSVC crashed
API: fixed cancelling of snapshots, previously this could lead to inconsistent VM configs (bug #6877)
API: fixed identifying disk images by UUID (bug #11209)
3D Support: several fixes
VRDP: fixed occasional crash with external authentication (bug #11156)
VGA: fix for double scan text modes
USB: fixed invalid pending request count at the time of service of DEVICE POWER requests (Windows hosts only; bugs #10021, #11056)
USB keyboard: Korean keyboard workaround (bug #11150)
Storage: fixed hang with QCOW images and asynchronous I/O enabled
Storage: fixed hang with newer VHD images (bug #11279)
Storage: actually write the non-rotational flag to the VM settings (4.2.0 regression)
Virtio-net: fixed the problem with network statistics counters in Session Information dialog (GUI)
Metrics: introduced network rate and disk usage metrics
Metrics: fixed a crash under certain conditions on Solaris hosts
BIOS: fix for El Torito
Shared Folders: if the host folder of a shared folder mapping does not exist, keep it active but mark it as invalid to prevent inconsitent saved states (bug #11147)
VBoxManage: fixed converting disks from raw images
VBoxManage: show snapshot description in the VM or snapshot information
VBoxManage: make implicit opening of media consistent in all places dealing with media
VBoxManage: the iSCSI initiator name was not stored in the settings file when doing storageattach (bug #11212)
VBoxManage: metrics collect now properly handles ‘CPU/MHz’ and ‘Net/*/LinkSpeed’ metrics
VBoxManage: changing the image UUID or parent UUID as part of storageattach works now in all safe cases
VBoxManage: introduced storageattach –medium additions as a shortcut to mount the additions image (bug #11165)
OVF: fixed importing OVF files cerated by recent VMware products (bug #10905)
Linux hosts / Bridged Networking: fixed the problem with leaking connections in conntrack (bug #11178)
Linux Additions: added support for ConsoleKit sessions in the vminfo service of VBoxService
Linux Additions: don’t crash during remount under certain conditions (bug #11291)
Linux/Solaris Additions: fixed guest memory metrics collection
Solaris hosts: added a dependency to ensure that the user directories are reachable when starting VBox services
Windows host installer: integrated user-contributed translations, thanks to all contributors!
Windows Additions: fixed auto-logon installation for Windows 8
Windows Additions: don’t fail if the shared folders host service is not available
Windows Additions: fixed Guest Additions startup on Windows 2000 guests (bug #11253)
Windows Additions: auto-resize fixes for Windows 8 guests

ubuntu 12.10/12.04用户安装：
编辑源列表：
gksudo gedit /etc/apt/sources.list

添加源：
deb http://download.virtualbox.org/virtualbox/debian precise contrib
ubuntu 11.10 用户添加下面的源：
deb http://download.virtualbox.org/virtualbox/debian oneiric contrib

添加公钥：
wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | sudo apt-key add –

更新源并安装：

sudo apt-get update
sudo apt-get install virtualbox-4.2

其他系统用户可在官方下载：https://www.virtualbox.org/wiki/Linux_Downloads

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