I installed Ubuntu server 21.10 on my Windows 7 to make a minecraft server, yet learned that there is a better way to do it without Ubuntu. The person helping recommended I install Windows 10 and remove Ubuntu to make it. I have the Windows 10 ISO file on my USB key and changed the BIOS booting priority so it's number 1. But when I restarted the computer, nothing happened and Ubuntu launched as it would normally. So I went to check the BIOS order, and somehow, even if I saved the modifications before rebooting, ubuntu is on top of the priority list, my USB key number 2. I retried changing the order, putting ubuntu last and making sure I save before exiting, but the same thing keeps happening.
I also tried pressing enter on start up to manually select a boot option, but when I press enter to select my USB key with the Windows 10 ISO, the screen turns black and then loops back the the same boot menu.
Anyone knows how I could fix this ? (trying to install it on Windows 7 ThinkPad)