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[Stephan T <1787867@xxxxxxxxxxxxxxxxxx>]

I can confirm this bug still exists on 20.04 after testing my desktop
and laptop.

Using hciconfig to turn off visibility works and does survive a reboot.

After using hciconfig and opening the Bluetooth settings panel,
visibility turns on. When closing the panel, visibility turns off. So
hciconfig seems to fix the bug for now. Still, it would be better if
this never happened in the first place since it does seem to be a
security issue.

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Packages, which is subscribed to indicator-bluetooth in Ubuntu.
https://bugs.launchpad.net/bugs/1787867

Title:
  Ubuntu 18.04 LTS bluetooth left discoverable

Status in indicator-bluetooth package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu 18.04 LTS, when Bluetooth is on, the computer stays
  discoverable which opens up unnecessary vulnerability surface. There
  should be a separate UI switch for discoverability with auto timeout.
  Leaving bluetooth on (using a Bluetooth mouse) should not leave the
  computer always discoverable.

  Current behavior does not match documentation
  https://help.ubuntu.com/stable/ubuntu-help/bluetooth-
  visibility.html.en, even without Bluetooth panel open, the computer is
  still discoverable.

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