Ubuntu: Why do I receive 'file open error' message?


I am trying to download swift 3.1.1 using ubuntu16.04 using the tutorial found at this link: https://swift.org/download/#using-downloads

However, when I try to verify the signature file (step 4), I get

gpg: can't open `swift-3.1.1-RELEASE-ubuntu16.04.tar.gz.sig'  gpg: verify signatures failed: file open error  

What am I doing wrong?

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