How to solve the problem in windows 10 (related to UNetBootin)?

Question

linux

Hello!
I wanted to put Linux ubuntu next to windows 10. I tried the method without a flash drive. It was necessary to create a partition for Linux, and install it there. I downloaded the UNetBootin program and the Linux ISO file. With unetbutin, I made drive C (the one where Windows 10 stands) bootable. Installed all that is needed, and rebooted the PC. Linux installation began, I waited, and it was installed safely. I got acquainted a little, and left, as it was already late. In the morning I go in, and there is no Linux in the choice, but only Windows 10 and the same unetbutin. I went back to unetbutin because I thought that it would already be Linux, but no, the same installation started again. I turned it off and went into Windows 10. I thought that I needed to delete the download files. Deleted, rebooted, but the unitbutin did not disappear. I tried rolling back Windows, but that didn't help either. Help please, what should I do??? Below are some screenshots
The problem that pops up when starting unitbutin
How to remove it from here?

Answer 1

I wanted to put linux ubuntu next to windows 10.

Put it in virtual machine. As a last resort - wsl.

spoiler

what is the majority trying to arrange dual-boot...?