题外话：在centos6.5下，我使用vmware，在安装完windows（xp、win7）系统后，在安装vmware-tools时，总是会导致centos崩溃，试过关闭selinux等操作均无效，但是virtualbox没有问题，这也是我使用virtualbox的原因。但win7启用不了透明效果，可能就这点差异影响的吧，感觉vmware更底层一点。
但是我在windows下时，以及换了系统后，如openSUSE、fedora下时，则不会导致崩溃，所以应该不是硬件问题。
硬件环境：thinkpad x230
将系统换成了fedora，虚拟机总是免不了的，因为前面在centos下时用的是virtualbox，已经有了创建安装好的虚拟机文件，因此这会自然也要装个virtualbox。
官方下载中，没有适用于最新的fedora 20的安装包，因此我下载的是相对新的：
VirtualBox-4.3-4.3.10_93012_fedora18-1.x86_64.rpm
安装时，发现缺少依赖：
[liyd@localhost Downloads]$ sudo rpm -ivh VirtualBox-4.3-4.3.10_93012_fedora18-1.x86_64.rpm
[sudo] password for liyd:
warning: VirtualBox-4.3-4.3.10_93012_fedora18-1.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID 98ab5139: NOKEY
error: Failed dependencies:
libSDL-1.2.so.0()(64bit) is needed by VirtualBox-4.3-4.3.10_93012_fedora18-1.x86_64
libpng15.so.15()(64bit) is needed by VirtualBox-4.3-4.3.10_93012_fedora18-1.x86_64
libpng15.so.15(PNG15_0)(64bit) is needed by VirtualBox-4.3-4.3.10_93012_fedora18-1.x86_64
[liyd@localhost Downloads]$
想通过yum安装，下面两个源里存在，但是第一个，发现：
[liyd@localhost Downloads]$ sudo yum install libSDL
Loaded plugins: langpacks, refresh-packagekit
No package libSDL available.
Error: Nothing to do
[liyd@localhost Downloads]$
居然没有这个包，没办法，还是得手动网上找啊，到pkgs上搜一下，该包居然没有fedora版的，下载一个openSUSE的将就吧，同样是rpm格式。
下载后安装，libSDL居然依赖libesd，而libesd又依赖libaudiofile，真是一层套一层啊，没办法，源里同样没有只能麻烦点一个个手动下了，终于搞齐，安装：
[liyd@localhost Downloads]$ sudo rpm -ivh libSDL-1_2-0-1.2.15-60.16.x86_64.rpm
warning: libSDL-1_2-0-1.2.15-60.16.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID c862b42c: NOKEY
error: Failed dependencies:
libesd.so.0()(64bit) is needed by libSDL-1_2-0-1.2.15-60.16.x86_64
[liyd@localhost Downloads]$ sudo rpm -ivh libesd0-0.2.41-43.18.x86_64.rpm
warning: libesd0-0.2.41-43.18.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID e1bf12f6: NOKEY
error: Failed dependencies:
libaudiofile.so.1()(64bit) is needed by libesd0-0.2.41-43.18.x86_64
[liyd@localhost Downloads]$ sudo rpm -ivh libaudiofile1-0.3.6-39.4.x86_64.rpm
warning: libaudiofile1-0.3.6-39.4.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID e1bf12f6: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:libaudiofile1-0.3.6-39.4 ################################# [100%]
[liyd@localhost Downloads]$ sudo rpm -ivh libesd0-0.2.41-43.18.x86_64.rpm
warning: libesd0-0.2.41-43.18.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID e1bf12f6: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:libesd0-0.2.41-43.18 ################################# [100%]
[liyd@localhost Downloads]$ sudo rpm -ivh libSDL-1_2-0-1.2.15-60.16.x86_64.rpm
warning: libSDL-1_2-0-1.2.15-60.16.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID c862b42c: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:libSDL-1_2-0-1.2.15-60.16 ################################# [100%]
[liyd@localhost Downloads]$ sudo rpm -ivh VirtualBox-4.3-4.3.10_93012_fedora18-1.x86_64.rpm
warning: VirtualBox-4.3-4.3.10_93012_fedora18-1.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID 98ab5139: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:VirtualBox-4.3-4.3.10_93012_fedor################################# [100%]
Creating group 'vboxusers'. VM users must be member of that group!
No precompiled module for this kernel found -- trying to build one. Messages
emitted during module compilation will be logged to /var/log/vbox-install.log.
Stopping VirtualBox kernel modules [ OK ]
Recompiling VirtualBox kernel modules [FAILED]
(Look at /var/log/vbox-install.log to find out what went wrong)
[liyd@localhost Downloads]$
安装一路绿灯，但是linux版virtualbox的通病还是存在，初始化失败了。跟在openSUSE下时一样，安装依赖包：
sudo yum install make gcc gcc-c++ kernel kernel-devel
之后重启系统，运行：
sudo /etc/init.d/vboxdrv setup
再启动virtualbox，熟悉的界面终于出现了！