There is a lot documentation for Ubuntu ... for example this page may help ...
https://help.ubuntu.com/community/How_to_dual-boot_Ubuntu_and_XP_after_installing_them_separately_on_two_HDs -jim
There is a lot documentation for Ubuntu ... for example this page may help ...
https://help.ubuntu.com/community/How_to_dual-boot_Ubuntu_and_XP_after_installing_them_separately_on_two_HDs -jim