Ok I troubleshot this problem.
Apparently, it came from the package `connman`, an Intel utility to
manage wlan and bluetooth that I installed wrongly since it's intended
for embedded systems.
Removing it solved all my problems.
** Package changed: bluez (Ubuntu) => connman (Ubuntu)
** Changed in: connman (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1762603
Title:
bluetooth keeps turning off
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