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Better document the (lack of) BlueTooth support in Tails

Currently, the only reference to Bluetooth support in Tails is in https://tails.boum.org/doc/advanced_topics/wireless_devices.

Which is misleading since Tails doesn’t include the required software stack to do anything useful with BlueTooth out of the box.

People reported being able to use a Bluetooth keyboard after installing the `gnome-bluetooth` package and its dependencies. But we don’t want to encourage people to use BlueTooth input devices as they are insecure when trying to protect from a local adversary. Other use cases of BlueTooth might be worth being supported (connecting to Internet via a smartphone for example).

Note that we shouldn’t consider this as a corner case as recent iMac comes with a Bluetooth keyboard and mouse by
default: https://www.apple.com/imac/features/

What we should do:

  • Document this as a security feature somewhere. Maybe /doc/advanced_topics/wireless_devices/ is good enough.
  • Document this as a known issue and point to the doc explaining why.

This way we don’t even have to add it to the FAQ.

Feature Branch: doc/7787-bluetooth

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Original created by @sajolida on 7787 (Redmine)

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