Excel Formula Primera Letra Mayuscula

It takes only seconds to sha256sum/etc a downloaded ISO, and it provides reassurance you weren't attacked by MITM etc. Beyond that, those seconds are insurance for the [hours of] time wasted if you had a few bit errors and debugging necessary chasing errors no-one else gets because of your download (eg. you have network issues & so try to debug; but networking is stuffed because that's what the few bits wrong were...) Think of checksum-checks as very cheap insurance.