在VirtualBox4.3.0下安装了最新的CentOS7，选择的是带GUI的服务器，安装VBOXADDITIONS报错，不能实现与物理机的无缝切换：
[root@CentOS7x64 ~]# ls
anaconda-ks.cfg initial-setup-ks.cfg VboxAdditions 公共 模板 视频 图片 文档 下载 音乐 桌面
[root@CentOS7x64 ~]# cd Vbox*
[root@CentOS7x64 VboxAdditions]# ll
总用量 56556
drwxr-xr-x. 2 root root 23 10月 15 2013 32Bit
drwxr-xr-x. 2 root root 23 10月 15 2013 64Bit
-rw-r--r--. 1 root root 647 10月 9 2013 AUTORUN.INF
-rw-r--r--. 1 root root 6966 10月 15 2013 autorun.sh
drwxr-xr-x. 2 root root 51 10月 15 2013 cert
drwxr-xr-x. 2 root root 4096 10月 15 2013 OS2
-rw-r--r--. 1 root root 5523 10月 15 2013 runasroot.sh
-rw-r--r--. 1 root root 9655755 10月 15 2013 VBoxLinuxAdditions.run
-rw-r--r--. 1 root root 20726272 10月 15 2013 VBoxSolarisAdditions.pkg
-rw-r--r--. 1 root root 16790544 10月 15 2013 VBoxWindowsAdditions-amd64.exe
-rw-r--r--. 1 root root 311568 10月 15 2013 VBoxWindowsAdditions.exe
-rw-r--r--. 1 root root 10391152 10月 15 2013 VBoxWindowsAdditions-x86.exe
[root@CentOS7x64 VboxAdditions]# VBoxLinuxAdditions.run
bash: VBoxLinuxAdditions.run: 未找到命令...
[root@CentOS7x64 VboxAdditions]# ./VBoxLinuxAdditions.run
-bash: ./VBoxLinuxAdditions.run: 权限不够
[root@CentOS7x64 VboxAdditions]# chmod u+x *.run
[root@CentOS7x64 VboxAdditions]# ll
总用量 56556
drwxr-xr-x. 2 root root 23 10月 15 2013 32Bit
drwxr-xr-x. 2 root root 23 10月 15 2013 64Bit
-rw-r--r--. 1 root root 647 10月 9 2013 AUTORUN.INF
-rw-r--r--. 1 root root 6966 10月 15 2013 autorun.sh
drwxr-xr-x. 2 root root 51 10月 15 2013 cert
drwxr-xr-x. 2 root root 4096 10月 15 2013 OS2
-rw-r--r--. 1 root root 5523 10月 15 2013 runasroot.sh
-rwxr--r--. 1 root root 9655755 10月 15 2013 VBoxLinuxAdditions.run
-rw-r--r--. 1 root root 20726272 10月 15 2013 VBoxSolarisAdditions.pkg
-rw-r--r--. 1 root root 16790544 10月 15 2013 VBoxWindowsAdditions-amd64.exe
-rw-r--r--. 1 root root 311568 10月 15 2013 VBoxWindowsAdditions.exe
-rw-r--r--. 1 root root 10391152 10月 15 2013 VBoxWindowsAdditions-x86.exe
[root@CentOS7x64 VboxAdditions]# ./VBoxLinuxAdditions.run
Verifying archive integrity... All good.
Uncompressing VirtualBox 4.3.0 Guest Additions for Linux............
VirtualBox Guest Additions installer
Removing installed version 4.3.0 of VirtualBox Guest Additions...
Copying additional installer modules ...
Installing additional modules ...
Removing existing VirtualBox non-DKMS kernel modules [ 确定 ]
Building the VirtualBox Guest Additions kernel modules
Building the main Guest Additions module [失败]
(Look at /var/log/vboxadd-install.log to find out what went wrong)
Doing non-kernel setup of the Guest Additions [ 确定 ]
Installing the Window System drivers
Warning: unknown version of the X Window System installed. Not installing
X Window System drivers.
[ 确定 ]
Installing graphics libraries and desktop services componen[ 确定 ]
[root@CentOS7x64 VboxAdditions]#
应该是该VirtualBox版本不支持CentOS7的X Windows System。
安装从最新VirtualBox版本（CentOS7.0发布之后的20140715更新的4.3.14版）中提取的VBoxGuestAdditions（记为VBoxGuestAdditions-4.3.14）则没有提示任何问题，系统重启后可以无缝切换，功能正常。
（之所以不把VirtualBox4.3.0直接升级到4.3.14，是因为升级后发现以前的虚拟机都打不开。）
[root@CentOS7x64 VBOXADDITIONS_4.3.14_95030]# ll
总用量 58243
dr-xr-xr-x. 2 root root 2048 7月 15 23:59 32Bit
dr-xr-xr-x. 2 root root 2048 7月 15 23:59 64Bit
-r-xr-xr-x. 1 root root 647 10月 9 2013 AUTORUN.INF
-r-xr-xr-x. 1 root root 6966 7月 15 23:50 autorun.sh
dr-xr-xr-x. 2 root root 2048 7月 15 23:59 cert
dr-xr-xr-x. 2 root root 2048 7月 15 23:59 OS2
-r-xr-xr-x. 1 root root 5523 7月 15 23:50 runasroot.sh
-r-xr-xr-x. 1 root root 10239439 7月 15 23:54 VBoxLinuxAdditions.run
-r-xr-xr-x. 1 root root 20977664 7月 16 00:30 VBoxSolarisAdditions.pkg
-r-xr-xr-x. 1 root root 17338560 7月 15 23:48 VBoxWindowsAdditions-amd64.exe
-r-xr-xr-x. 1 root root 313472 7月 15 23:39 VBoxWindowsAdditions.exe
-r-xr-xr-x. 1 root root 10748464 7月 15 23:40 VBoxWindowsAdditions-x86.exe
[root@CentOS7x64 VBOXADDITIONS_4.3.14_95030]# ./VBoxLinuxAdditions.run
Verifying archive integrity... All good.
Uncompressing VirtualBox 4.3.14 Guest Additions for Linux............
VirtualBox Guest Additions installer
Removing installed version 4.3.0 of VirtualBox Guest Additions...
Copying additional installer modules ...
Installing additional modules ...
Removing existing VirtualBox non-DKMS kernel modules [ 确定 ]
Building the VirtualBox Guest Additions kernel modules
Building the main Guest Additions module [ 确定 ]
Building the shared folder support module [ 确定 ]
Building the OpenGL support module [ 确定 ]
Doing non-kernel setup of the Guest Additions [ 确定 ]
Starting the VirtualBox Guest Additions [ 确定 ]
Installing the Window System drivers
Installing X.Org Server 1.15 modules [ 确定 ]
Setting up the Window System to use the Guest Additions [ 确定 ]
You may need to restart the hal service and the Window System (or just restart
the guest system) to enable the Guest Additions.
Installing graphics libraries and desktop services componen[ 确定 ]
[root@CentOS7x64 VBOXADDITIONS_4.3.14_95030]# reboot
本文转自ICT时空dbasdk的博客，原文链接： 关于VirtualBox4.3.0下CentOS7安装VboxAdditions不成功的问题 ，如需转载请自行联系原博主。
