I can’t run Ubuntu from an external HDD

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I’ve been a Windows user all my life, but recently I’ve been taking a look at several Linux distros installing them on external HDDs.
I installed Ubuntu 20.04 (on an external HDD) to have a look at it and it turned out I liked it. So when I was prompted with the Minimal BASH-like line editing “error”, I tried to fix it following this guide: How to Fix Minimal BASH Like Line Editing is Supported GRUB Error In Linux?
Everything was great since then until I decided I didn’t want to depend on a hard drive whenever I wanted to use Ubuntu on my laptop. I created a 350GB partition on my internal disk (where I also have Windows 10) and installed a fresh copy of Ubuntu 20.04. When the installation menu asked me to select the “Device for boot loader installation” I choose Windows Boot Manager. Both Windows 10 and Ubuntu loaded perfectly, no need for external dependencies.
Now, the somewhat big problem that I’m facing is that I can’t run Ubuntu form the external HDD. I just want to take a look at some customization I made, that’s why I don’t want to reinstall it. I just need to take a final look before I format the HDD and try installing another OS.
If I set Ubuntu to load first in the boot sequence, my laptop loads the one installed on the internal HDD, even though the external is plugged.
I’ve been searching for help online, but I can’t get an answer, maybe I’m not addressing the issue properly. This is the first time I post to a forum, so if my problem has already been solved somewhere else, I would really appreciate you provide a link for me to take a look at it.

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