$ sudo apt-get install virtualbox-ose
Reading package lists... Done                          
Building dependency tree                               
Reading state information... Done                      
The following packages were automatically installed and are no longer required:
  libkexiv2-3 libexiv2-2 libkdcraw3                                            
Use 'apt-get autoremove' to remove them.                                       
The following extra packages will be installed:                                
  dkms linux-headers-2.6.25-1-386 linux-ports-headers-2.6.25-1 virtualbox-ose-source
The following NEW packages will be installed:                                       
  dkms linux-headers-2.6.25-1-386 linux-ports-headers-2.6.25-1 virtualbox-ose-source
The following packages will be upgraded:                                            
  virtualbox-ose                                                                    
1 upgraded, 4 newly installed, 0 to remove and 2 not upgraded.                      
Need to get 7173kB of archives.                                                     
After this operation, 8897kB of additional disk space will be used.                 
Do you want to continue [Y/n]?                                                      
Get:1 http://br.archive.ubuntu.com intrepid/universe virtualbox-ose 2.0.2-dfsg-0ubuntu1 [6231kB]
Get:2 http://br.archive.ubuntu.com intrepid/universe linux-ports-headers-2.6.25-1 2.6.25-1.2 [2002B]                                          
Get:3 http://br.archive.ubuntu.com intrepid/universe linux-headers-2.6.25-1-386 2.6.25-1.2 [558kB]                                            
Get:4 http://br.archive.ubuntu.com intrepid/main dkms 2.0.20.4-0ubuntu1 [55.2kB]                                                              
Get:5 http://br.archive.ubuntu.com intrepid/universe virtualbox-ose-source 2.0.2-dfsg-0ubuntu1 [327kB]                                        
Fetched 7173kB in 7min0s (17.1kB/s)                                                                                                           
Preconfiguring packages ...                                                                                                                   
(Reading database ... 173650 files and directories currently installed.)                                                                      
Preparing to replace virtualbox-ose 1.6.2-dfsg-1ubuntu2 (using .../virtualbox-ose_2.0.2-dfsg-0ubuntu1_i386.deb) ...                           
Shutting down VirtualBox host networking ...done.                                                                                             
 * Stopping VirtualBox kernel module vboxdrv                                                                                            [ OK ] 
Unpacking replacement virtualbox-ose ...                                                                                                       
Selecting previously deselected package linux-ports-headers-2.6.25-1.                                                                          
Unpacking linux-ports-headers-2.6.25-1 (from .../linux-ports-headers-2.6.25-1_2.6.25-1.2_all.deb) ...                                          
Selecting previously deselected package linux-headers-2.6.25-1-386.                                                                            
Unpacking linux-headers-2.6.25-1-386 (from .../linux-headers-2.6.25-1-386_2.6.25-1.2_i386.deb) ...                                             
Selecting previously deselected package dkms.                                                                                                  
Unpacking dkms (from .../dkms_2.0.20.4-0ubuntu1_all.deb) ...                                                                                   
Selecting previously deselected package virtualbox-ose-source.                                                                                 
Unpacking virtualbox-ose-source (from .../virtualbox-ose-source_2.0.2-dfsg-0ubuntu1_all.deb) ...                                               
Processing triggers for man-db ...                                                                                                             
Setting up virtualbox-ose (2.0.2-dfsg-0ubuntu1) ...                                                                                            
Installing new version of config file /etc/init.d/virtualbox-ose ...                                                                           
Installing new version of config file /etc/init.d/vboxdrv ...                                                                                  

Setting up linux-ports-headers-2.6.25-1 (2.6.25-1.2) ...
Setting up linux-headers-2.6.25-1-386 (2.6.25-1.2) ...  
Examining /etc/kernel/header_postinst.d.                
run-parts: executing /etc/kernel/header_postinst.d/nvidia-common

Setting up dkms (2.0.20.4-0ubuntu1) ...
Setting up virtualbox-ose-source (2.0.2-dfsg-0ubuntu1) ...
 * Reloading kernel event manager...                                                                                                    [ OK ] 
Adding Module to DKMS build system                                                                                                             
Doing initial module build                                                                                                                     

Error! Your kernel source for kernel 2.6.27-3-generic cannot be found at
/lib/modules/2.6.27-3-generic/build or /lib/modules/2.6.27-3-generic/source.
Installing initial module                                                   

Error! Could not locate vboxdrv.ko for module vboxdrv in the DKMS tree.
You must run a dkms build for kernel 2.6.27-3-generic (i686) first.    
Done.