My question is virtually the same as another asked here (https://askubuntu.com/questions/282512/how-to-move-ubuntu-12-04lts-from-usb-to-hdd), but a little ambiguity leaves me wondering if the answer applies to me.
I installed Ubuntu to boot from a 4GB USB drive with a 8GB linux partition residing on the hdd alongside a windows partition. With the usb drive plugged in, I get a grub boot menu that includes my linux install and Windows 7. With the usb unplugged it boots directly into Windows. I want to revise the installation so that it boots from grub without the usb drive plugged in. Assistance in how to do that, or confirming that the answer given in the existing thread applies to my condition as well, is appreciated.