VirtualBox 4.1.6 是一个维护版本，主要是 bug 的修复，内容包括：
VRDP: fixed screen corruption
NAT: the interface stopped working after a lot of failed ICMP requests (bug #9371)
E1000: fixed rare Windows 7 guest hangs, either at boot time or when reconfiguring the network card in unusual setups (bug #6223)
ATA: fixed a possible crash during ATAPI passthrough with certain guests
ATA: improved compatibility with ancient Linux kernels
Main: fixed incorrect framebuffer information after leaving the fullscreen mode with X11 guests, this lead to a scrambled preview window in the GUI for example
Mac OS X hosts: fixed the problem with duplicate packets when bridged to a wireless interface (bug #9648)
Linux hosts: fix for 3D support on Fedora 15 (bug #9799)
Linux hosts: don’t call del_timer_sync from an interrupt context (Fedora bug report 746331)
Windows Vista and 7 guests: more WDDM fixes
Linux Additions: fixed kernel module compilation failure on Redhat Enterprise Linux 4 (bug #9709)
Linux Additions: install the DRI driver correctly on Ubuntu 11.10 guests
Solaris Additions: added read-only mmap support for shared folders
Solaris Additions: added directory, file mode and mask options for shared folders
Windows Additions: implemented faster detection of logged-in guest users and stale sessions
X.Org Additions: fixed graphical corruption when switching to a virtual terminal (bug #9490)
在 Ubuntu 11.10 下的安装方法如下：
首先编辑 sources.list
gksudo gedit /etc/apt/sources.list
增加如下一行
deb http://download.virtualbox.org/virtualbox/debian oneiric contrib
如果是 Ubuntu 11.04 则是增加
deb http://download.virtualbox.org/virtualbox/debian natty contrib
保存退出，然后：
wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | sudo apt-key add -
更新 sources.list 文件
sudo apt-get update
开始安装
sudo apt-get install virtualbox-4.1
sudo apt-get install dkms
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