try to download the bitcoin-0.11.0-linux64.tar.gz again and from a different pc and check it again.
and you should change the topic of the thread to something like "bitcoin-core signature is not right" instead of what it is right now.
Please read the thread instead of posting nonsense. (Ah, I see you are participating in a sig ad campaign. Nevermind, clearly you aren't here to share knowledge, and are just trying to increase your post count by making a post that you feel is vaguely related to the topic.)
There is nothing wrong with the bitcoin-core signature.
The OP simply didn't understand how to properly use the tool that he chose for verifying the signature.