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Typically something like a yubi key, a smartphone app, or even a code sent via SMS to a phone, or verbally to a voice phone.

I really hope no one is going to try to force me to carry a phone around all the time (I only have one with me when I'm expecting a call or planning to call someone myself). Those yubi keys look interesting, but it's still an extra piece of hardware that has to be bought and carried around (and not lost).

Ubuntu forums has subforums for all over the world. Your phone/SMS thing needs to work for every country.

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