Ubuntu Can't Verify SSL Certs

I found something like this while wget a file from https protocol:

Unable to locally verify the issuer's authority.

What it's saying is that its knowledge about ssl certs doesn't cover the one we're using.

Fortunately, it can be solved using :

apt-get install ca-certificates  

And here is the description of the package.

PEM files of CA certificates to allow SSL-based applications to check for the authenticity of SSL connections.

Konpat Preechakul

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