It looks like you're not the only one who ran into this problem after upgrading to 2.6.24-20-generic. This how-to describes how to compile the modules from source: http://technologytales.com/2008/07/27/getting-virtualbox-working-on-ubuntu-after-a-kernel-upgrade/
It looks like you're not the only one who ran into this problem after upgrading to 2.6.24-20-generic. This how-to describes how to compile the modules from source: http:// technologytales .com/2008/ 07/27/getting- virtualbox- working- on-ubuntu- after-a- kernel- upgrade/