虚拟机安装全过程
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开源虚拟机的VirtualBox团队于本周四正式释放出了第三个VirtualBox 5.0测试版本。
VirtualBox 4.0的最后一个主要版本在2010年12月发布，它采用了新的图形化用户界面，新的虚拟化硬件和重组的项目设计，进行了重大的改版。但项目主要版本的发布步伐缓慢，上一次重要版本（版本4.3）在2013年底才发布。从那时起，一切都被正式称为“维护”发布。
时隔五年之后的今年四月，VirtualBox，由Sun公司创建，现在由甲骨文管理的开源虚拟化系统，获得了近5年来第一次的主版本更新发布，还是有新的东西加入：Windows/Linux等客户虚拟机支持PV、XHCI控制器支持USB 3.0设备、双向复制和粘贴。
在VirtualBox 5.0 Beta 3中也带来了很多Bug修复，客户机可获得XSAVE/AVX/AVX2等扩展、改进GUI加密、改进音量控制、修复SB16播放等改进。
VirtualBox 5.0 Beta 3下载地址：http://download.virtualbox.org/virtualbox/5.0.0_BETA3
VirtualBox 5.0 Beta 3发行说明：https://www.virtualbox.org/pipermail/vbox-announce/2015-May/000122.html
而相比于VirtualBox 5.0 Beta 2的改变主要有：
VMM: XSAVE, AVX and AVX-2 are now exposed to the guest (bug #11347)
VMM: fixed a Guru Meditation when rebooting certain guests (for example Solaris doing fast reboot) by fixing the implementation for INIT IPI)
GUI: Encryption progress reflection (see here)
GUI: Encryption errors handling (see here)
GUI: Properly disable unavailable menu actions (see here)
GUI: properly report errors when trying to save the VM settings instead instead of dead-locking (seehere)
API: allow to hotplug SATA optical devices (see here)
VRDP: fixed listening for IPv6 on some systems (bug #14038)
USB: fixed attaching of high speed USB devices if xHCI is not present (they always ended up on the OHCI controller)
Audio: improved volume control
Audio: fixed SB16 playback
Drag and drop: Transfers can be canceled properly, bug fixes
Guest Control: Major overhaul, for example fixing wrong parameter quoting (bug #13157)
Shared Folders: fixed a crash when removing (in some cases also when creating) a shared folder when the VM is running (see here)
OVA: fixed importing of appliances without attached hard disks (see here)
Snapshots: fixed a bug in handling a saved state when taking an offline snapshot
Snapshots: fixed a sporadic bug when restoring a snapshot which left unused diff images behind
VirtualKD: re-added device which was omitted by accident (see here)
Windows hosts: more hardening fixes (e.g. bugs #14051, #14052)
Additions/X.Org: fixed guest-to-host mouse mapping for Solaris and Linux Mint/Ubuntu 12.04.0 guests.
Additions/X.Org: fixed resizing problem in openSUSE 10.3 and guests of a similar generation (see here)
documented the Guest Additions heartbeat service
更多详情：virtualbox.org/
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