So recently I've gotten my hands onto a decent enough hard drive that can run Ubuntu good enough and installed it. It was a Toshiba 1TB USB 3.0, though I don't know the model.
I installed Linux on the Toshiba hard drive. Using the "Something Else" install option, I gave it 2GB (2048mb) of Swap storage and 128GB (131072mb) for the main OS, and after installation, I created a partition out of the rest of the storage on it in Windows 10 for storage that both OSes can read. My windows 10 is installed on my Internal SSD, typical.
So here's my problem: I can't install Ubuntu on my PC without it overwriting the default Windows 10 bootloader. This is a problem for a couple of reasons. One thing is that I can't boot into either OS I have without the Hand Drive plugged in. If I try to, it'll say something about the ubuntu install not being present and readable, and it enters GRUB recovery mode which I have no knowledge of.
Another reason is that last time I installed Ubuntu, it was a disaster. I made a partition on my hard drive for Ubuntu, and dual booted it. I thought that the GRUB bootloader was normal at the time and nothing to do with the install, even though it's sorta Ubuntu styled, I left it. Then something happened, I suspect it to do with Windows Update, I suddenly couldn't boot to it. I had to get a hard drive, even when inspecting it with one of my friends who has lots of knowledge on Windows (and nothing with Linux). So I decided to not partition anything and install Ubuntu onto a seperate hard drive. Then, I did as mentioned above before describing my problem. And this is to do with the Bootloader, though I still don't want to do anything with partitioning my Internal SSD, which again, has nothing but Windows.
So anyways, I have Windows Update installed, disabled all Windows Services and Tasks that auto updates anything, and I'm careful whenever updating ANYTHING, even my video games.
And before you say that I should just use some application that installed some other Windows Bootloader, I tried, but the outcome wasn't anything that I could live with. I used the only application I know of, but it didn't work. The only bootloader that I could install was the Windows 7 one, since that was the latest. I had no problem with the Windows 7 bootloader, but the Ubuntu wouldn't boot. When I tried selecting my Toshiba as my temporary boot device, it just went back to the menu to select a temporary boot device almost immediately.
I need some way to get rid of the GRUB Bootloader while being able to boot to my Toshiba Ubuntu Hard Drive. Thanks, SwagMasterIV
P.S. I use a ThinkPad T540p laptop, if that info is any useful.