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Tor browser won't load

My OS is Ubuntu 16.04. I have tried to download from the Tor website and using Unbuntu's software package. Each time I get a message titled Signature Verification Failed. The message is: "You might be under attack, or there might just be a networking problem. Click Start try the download again." I have tried many times, always getting the same result. I have wiped the hard drive and reloaded Unbuntu 3 times. I have loaded Tor on my laptop which uses the same router and Internet connection.