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There's no simple way. Basically you use a tool to manually inspect the certificate returned by opening a connection to the website, compare it to the certificate from a computer that does not exhibit this problem and see if the certificates are the same. If they are not the same them you are sufferring from an SSL MITM attack.
IITRC you can view certificates using the openssl command line tool can be used to view certificates, or if you are not scared to program, you can write a short script that does that in any programming language with openssl bindings.
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