Kubuntu 24.04 Bluetooth

Kubuntu 24.04 LTS has totes open bluetooth issues. Use proprietary dongle until issues are resolved.

My Issue

Ubuntu Core Bluetooth IFs

Ref: Ubuntu Core Docs

BlueZ

• The official Linux BT stack.
• Provides support for the core BT layers and protocols.

BlueZ Modules

• Bluetooth kernel subsystem core
• L2CAP and SCO audio kernel layers
• RFCOMM, BNEP, CMTP and HIDP kernel implementations
• HCI UART, USB, PCMCIA and virtual device drivers
• General Bluetooth and SDP libraries and daemons
• Configuration and testing utilities
• Protocol decoding and analysis tools

Two BT-related IFs on Ubuntu Core

• Bluetooth on Ubuntu Core is provided by the BlueZ stack.
• bluetooth-control - The lower level comes with the kernel snap
• bluez IF - The user-space portion can be installed in a separate snap.

Bluez IF

• The bluez IF is not installed by the core snap, neither the gadget nor kernel. It shall be installed by the application snap
• The plug is the client.
• The slot provides access to the bluez (Bluetooth) service.
• Connecting the two allows a client to access devices registered by the bluez service through the slot.
• Example: An app with a bluez plug could connect to the system's bluez slot to access a BT game controller.

bluetooth-control IF

• The bluetooth-control IF is installed by the core snap.
• Accesses BT hw directly
• bluetooth-control allows managing the kernel BT stack

IF Mgmt

SNAPa plug (consumes) -> IF -> SNAPb slot (provides)

• A slot can support multiple plug connections.

snap connections|grep blue

Output:

• bluetooth-control SLOT is provided by the core snap
• bluez - no snap exists which provides a slot based on the bluez IF. You need an application snap to reveal it.