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.
It seems that BT 5.3 in USB format is a challenge to find, let alone support under Linux. If 5.0 is acceptable, the TP Link UB500 uses an RTL8761B chipset which has been supported since around kernel 5.16.
I have a few UB500 and UB400 adapters and both have worked OOTB without issue under Fedora.