xp为主机，在SUN VIRTUALBOX2.0.4虚拟机中装的ubuntu-8.10-desktop-i386，可是增强包装了几次都不行为什么呢，大家帮我看看，下面是安装时的终端记录：

rickie@rickie-desktop:~$ sudo -s -H
[sudo] password for rickie:
root@rickie-desktop:/home/rickie# cd /media/cdrom0
root@rickie-desktop:/media/cdrom0# ls
32Bit VBoxLinuxAdditions-amd64.run VBoxWindowsAdditions-amd64.exe
64Bit VBoxLinuxAdditions-x86.run VBoxWindowsAdditions.exe
AUTORUN.INF VBoxSolarisAdditions.pkg VBoxWindowsAdditions-x86.exe
root@rickie-desktop:/media/cdrom0# ./VBoxLinuxAdditions-x86.run
Verifying archive integrity... All good.
Uncompressing VirtualBox 2.0.4 Guest Additions for Linux

installation.................................................................................................................................................

........................................
VirtualBox 2.0.4 Guest Additions installation
Building the VirtualBox Guest Additions kernel module...
Building the shared folder support kernel module...
Installing the VirtualBox Guest Additions...

Successfully installed the VirtualBox Guest Additions.
You must restart your guest system in order to complete the installation.


都提示安装成功了，可是重启下虚拟系统还是不能在主机和Ubuntu之间自由切换，还要按热键，请大家帮我看看，我是初学者，谢谢了。。。