I (mac user) followed these instructions and am trying to use my USB drive to install Ubuntu on a NV57H94u Gateway computer. The computer was running Windows 7, but was reset to factory settings. I changed the boot order so that the computer booted from the USB, and this worked fine. If I click "try Ubuntu," I can use Ubuntu. However, if I try to install it, I am told that I don't have the required 4.5 GB available hard drive space. I went back, clicked "try Ubuntu," and used disk utility to determine that Ubuntu is only able to see the USB drive it is running off of. Does anyone know how to make it recognize the computer's hard drive so that I could install Ubuntu on it? Any help would be greatly appreciated. Thanks for reading!