Congrats, you have successfully verified your Electrum download with all three keys. You can now safely install and start using it.

The reason it tells you that each key is not certified by you or anybody else is simply because although you have imported these keys in to Kleopatra, you have not yet told Kleopatra you trust these keys, and no one in your web of trust trusts them either. This warning can be safely ignored if you want, or you can now tell Kleopatra that these keys are trusted to remove this warning.

I can confirm that the three keys you have match the three keys I have, and they also match the three keys DireWolfM14 has shown in his screenshots higher up in this thread.

To do this on Kleopatra, you'll first need to create your own PGP key pair using File -> New Key Pair and following the instructions. Once you've done that, you can then right click on any of the three developer's keys and click Certify, and certify their key with your own key. Once you've certified all three keys, verify your Electrum download again and that warning will have disappeared.