Google Calendar erroneously identifies Opera as mobile

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http://superuser.com – I am a happy user of Google Calendar across different machines, browsers. However, when I am working with Opera 12.16 on my Ubuntu 12.04 machine, opening Google Calendar will automatically select the mobile version of the calendar, which is annoying. How can I fix this problem? Is this an identification issue? GMail and Google Search just show up normal. (HowTos)