Can you recommend a Bluetooth dongle that support s version 5.3, not too terribly expensive and available in Europe? Preferably works out of the box on Ubuntu LTS, but compiling my own kernel is also acceptable.
For context my last attempt ended with one that only works with Windows 10, when no other Bluetooth receiver is connected. Cherry on top it needs troubleshooting wizard after each reboot.
I can really recommend those cards! They come in several sizes for laptop and desktop. I am not sure about USB. Just make sure you get the regular PCIe version and not the CNVio version (unless you have a compatible Intel Mainboard and somewhat recent processor). They differ in the naming, e.g. AX210/AX211 if I remember that right.