I have been reading to see if I may fix the problem by copying another user's advice, but it seems that problems are a bit unique in Linux. I'm a windows user, so using the command line is kind of foreign to me, but I did follow some instructions and have the boot repair report.
I duel booted onto the same 2TB HDD, partitioning a section off for the Ubuntu installation which I installed by using a USB flash drive, having to follow the additional instructions of renaming isolinux to syslinus and doing the same to isolinux.cfg and isolinux.bin. Dunno if it means anything to you, but I know it was something I had to do that wasn't automatically done for me, so I figured that's a possible source of user error.
Not sure what other information to give as I can't really think of any more details.
[SOLVED] In the boot menu where I could select my USB to install Ubuntu from, there was one option that literally had "UEFI:" before the USB stick name. Don't pick that one. That will apparently tell your PC to NOT put GRUB in sda. [SOLVED]