Just wiping Windows 7 and installing Ubuntu is easier than installing Ubuntu as dual boot. The small steps you want to take are larger than the steps I suggested. Note that this is only true because you already have a new computer with Windows 10. Dumping Windows altogether when first installing a Linux distribution is generally a bad idea.
As told to you by others, that won't work. To give you a slightly simplified version of the technical details: to be able to boot from a usb drive or a dvd, you need a specific piece of software, called a bootloader, in a specific place on the usb drive/dvd. This bootloader is present in the .iso file, but if you simply copy the .iso file somewhere into the filesystem of the usb drive, it won't end up in the right place. So you have to "burn" it to the usb or burn it "as an image" to the dvd. This replaces the entire filesystem of the usb drive with the filesystem present in the .iso file, which will put the bootloader in the right spot, making the usb bootable. Same on a dvd: instead of creating a new filesystem containing an .iso file, you have to use the .iso file itself as the filesystem of the dvd.
By replacing the filesystem on the usb drive, everything that was there will be erased automatically.1. Do I have to erase everything else that was on the thumb drive?
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