@wizardfromoz @captain-sensible
I cannot upload a video of the booting process, but I'm home and I'll start the new dual boot installation right now. I'll let you know if it was successful. Very excited!
This is something I love about Linux, propably the most. It's what makes Linux Linux today, it's the community and the helpful users who love sharing their advice to others.
Thank you so much, both of you, @wizardfromoz and @captain-sensible. I luckily keep all my important data on cloud services and several external data storage devices, just in case things go haywire one way or another. I still haven't moved or downloaded anything to my laptop from the backups, it...
And one thing to I want to say, I did a dual boot with Ubuntu and Windows 10 with the exact same instructions on an older laptop I had laying around, did it using Legacy mode on BIOS. Was it successful because of that? I have no idea, but I screwed this one up. But it's not really necessary...
I'll do as instructed, although I showed a picture of how my GParted looks like right now in the initiating post, but oh well, just to be safe and sound I will provide a new one just to be safe. I can get back on the matter on Friday when I get to go home.
I managed to fix it in a way, I can boot into Linux Mint as I told. It's hard to explain, but I'll get back on it on Friday. I'm on campus now and I don't have my home laptop with me. If there's something you want to ask, I can answer. I'll try to think of a more detailed or otherwise better...
Hey! I found some pictures that I actually took during the installation progress that might be helpful, I'm not sure if they are, but hopefully they are.
Here I made the partitions.
And here I started goofing up.
So, the laptop I use is an HP Pavilion (something), cannot remember the exact type, and I'm sorry. But I think it is one or two years old, and because it is so new, it definitely has UEFI and an EFI partition on the hard drive.
While I was doing the dual boot, I followed the instructions of...