Installing Ubuntu & FreeBSD on the same computer

You can look at
http://forums.freebsd.org/archive/index.php/t-614.html

Briefly, you can choose one of 4 options :
1. (assuming Ubuntu is installed first) Use grub loader. Then add FreeBSD to menu.lst
2. use 3rd party boot managers such as GAG
3. use vmware or other virtual machine software
4. one says that lilo boot manager can easily be configured to support linux and FreeBSD. But grub is preffered by the most of users.