The Issue
After a fresh installation of Arch Linux (using archinstall), my bluetooth was not working. The GUI toggle would toggle on and directly off again.
The Culprit
Read: https://wiki.archlinux.org/title/bluetooth
Run: pacman -Qs bluetooth
The package bluez-utils was missing from my system.
The Solution
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Install the missing package:
pacman -Syu bluez-utils
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Manual tryout:
sudo systemctl start bluetooth.service
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Enable the service to auto-start it on startup:
sudo systemctl enable bluetooth.service