Why doesn't Google Chrome 30+ negotiate TLS 1.2 ciphers in Ubuntu 12.04?

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http://askubuntu.com – On my Mac Google Chrome (v30) uses TLS 1.2 ciphers. I have noticed that when visiting the same websites using Google Chrome in Ubuntu, TLS 1.2 is never used but TLS 1.1 instead. (e.g. https://www.google.de) Why is this? Both computers are running the same version of Google Chrome. (HowTos)