sudo yum install VirtualBox
注意大小写！

再也不用去官方下载rpm包了，那样升级起来很麻烦

也许很久以前就有了，只不过我大小写输入错误导致没找到。比如
[octopus@pc3 Virtualbox]$ sudo yum install Virtualbox
Loaded plugins: langpacks, refresh-packagekit
No package Virtualbox available.
  * Maybe you meant: VirtualBox
Error: Nothing to do

回复：3楼

因为b没有大写

[octopus@pc3 Virtualbox]$ sudo yum install VirtualBox
Loaded plugins: langpacks, refresh-packagekit
Resolving Dependencies
--> Running transaction check
---> Package VirtualBox.x86_64 0:4.3.18-1.fc20 will be installed
--> Processing Dependency: VirtualBox-kmod = 4.3.18 for package: VirtualBox-4.3.18-1.fc20.x86_64
--> Processing Dependency: libgsoapssl++.so.3()(64bit) for package: VirtualBox-4.3.18-1.fc20.x86_64
--> Running transaction check
---> Package gsoap.x86_64 0:2.8.12-7.fc20 will be installed
---> Package kmod-VirtualBox-3.17.3-200.fc20.x86_64.x86_64 0:4.3.18-1.fc20.6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package                    Arch   Version         Repository              Size
================================================================================
Installing:
 VirtualBox                 x86_64 4.3.18-1.fc20   rpmfusion-free-updates  25 M
Installing for dependencies:
 gsoap                      x86_64 2.8.12-7.fc20   updates                231 k
 kmod-VirtualBox-3.17.3-200.fc20.x86_64
                            x86_64 4.3.18-1.fc20.6 rpmfusion-free-updates 218 k

Transaction Summary
================================================================================
Install  1 Package (+2 Dependent packages)

Total download size: 25 M
Installed size: 89 M
Is this ok [y/d/N]: y
Downloading packages:
(1/3): kmod-VirtualBox-3.17.3-200.fc20.x86_64-4.3.18-1.fc20 | 218 kB  00:03     
(2/3): gsoap-2.8.12-7.fc20.x86_64.rpm                       | 231 kB  00:04     
VirtualBox-4.3.18-1.fc20.x86_6 FAILED                                           
http://mirror.hust.edu.cn/rpmfusion/free/fedora/updates/20/x86_64/VirtualBox-4.3.18-1.fc20.x86_64.rpm: [Errno 12] Timeout on http://mirror.hust.edu.cn/rpmfusion/free/fedora/updates/20/x86_64/VirtualBox-4.3.18-1.fc20.x86_64.rpm: (28, 'Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds')
Trying other mirror.
(3/3): VirtualBox-4.3.18-1.fc20.x86_64.rpm                  |  25 MB  07:04     
--------------------------------------------------------------------------------
Total                                               33 kB/s |  25 MB  12:54     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction (shutdown inhibited)
Warning: RPMDB altered outside of yum.
  Installing : gsoap-2.8.12-7.fc20.x86_64                                   1/3
  Installing : VirtualBox-4.3.18-1.fc20.x86_64                              2/3
  Installing : kmod-VirtualBox-3.17.3-200.fc20.x86_64-4.3.18-1.fc20.6.x86   3/3
  Verifying  : kmod-VirtualBox-3.17.3-200.fc20.x86_64-4.3.18-1.fc20.6.x86   1/3
  Verifying  : VirtualBox-4.3.18-1.fc20.x86_64                              2/3
  Verifying  : gsoap-2.8.12-7.fc20.x86_64                                   3/3

Installed:
  VirtualBox.x86_64 0:4.3.18-1.fc20                                             

Dependency Installed:
  gsoap.x86_64 0:2.8.12-7.fc20                                                  
  kmod-VirtualBox-3.17.3-200.fc20.x86_64.x86_64 0:4.3.18-1.fc20.6               

Complete!
[octopus@pc3 Virtualbox]$

RTR3InitEx failed with rc=-1912 (rc=-1912)

The VirtualBox kernel modules do not match this version of VirtualBox. The installation of VirtualBox was apparently not successful. Executing

'systemctl restart systemd-modules-load.service ' as root

may correct this. Make sure that you do not mix the RPM Fusion version and the Oracle version of VirtualBox.

[octopus@pc3 ~]$ sudo systemctl restart systemd-modules-load.service
[sudo] password for octopus:
Sorry, try again.
[sudo] password for octopus:
[octopus@pc3 ~]$

内核太新了

算了，還是用官方RPM包吧。
[octopus@pc3 Virtualbox]$ sudo rpm -ivh VirtualBox-4.3-4.3.18_96516_fedora18-1.x86_64.rpm
[sudo] password for octopus:
warning: VirtualBox-4.3-4.3.18_96516_fedora18-1.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID 98ab5139: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...
   1:VirtualBox-4.3-4.3.18_96516_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  ]
Uninstalling old VirtualBox DKMS kernel modules            [  OK  ]
Trying to register the VirtualBox kernel modules using DKMS[  OK  ]
Starting VirtualBox kernel modules                         [  OK  ]
[octopus@pc3 Virtualbox]$

終於可以用了
只能說OSE版本真不穩定