I have followed the tutorial steps, which by the way it is very annoying no one mentions the need to type sudo before everything, and when I get to the steps requiring the download of the SHA256 files, I can only download the .gpg file, the other just opens up. but it doesnt matter because when i run the next step and use the line
gpg --keyid-format long --verify SHA256SUMS.gpg SHA256SUMS
it comes back saying
~$ sudo gpg --keyid-format long --verify SHA256SUMS.gpg SHA256SUMS
gpg: can't open 'SHA256SUMS.gpg': No such file or directory
gpg: verify signatures failed: No such file or directory
Help please, my attempts to install ubuntu have only been a disaster so far and i cannot understand why it is being so difficult.