For the record here.
I can confirm that the "Plugable" brand ( plugable.com ), USB Bluetooth 4.0 Low Energy Micro Adapter, works just fine on my Mageia 6 workstations. I have tried it with a Bluetooth keyboard and earphones and it responds nicely. As soon as it is plugged into the usb port of the workstation it is recognized and the Bluetooth icon is displayed.
https://plugable.com/products/usb-bt4le
Amazon product info
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Plugable USB Bluetooth 4.0 Low Energy Micro Adapter
https://www.amazon.com/gp/product/B009ZIILLI/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
usbview indicates the following information about it:
BCM20702A0
Manufacturer: Broadcom Corp
Serial Number: xxxxxxxxxxxxxxxxx
Speed: 12Mb/s (full)
USB Version: 2.00
Device Class: ff(vend.)