millahjovich. I’m afraid that this activity was a little while ago and I no longer have that Ubuntu machine to check things on, so this will all be from memory.
I too was able to connect a PS3 controller to Ubuntu via Bluetooth, but this required root privileges on the BT controller, which meant that I couldn’t connect to Hexy at the same time with the BT COM-port link.
The solution was to connect the PS3 controller via USB-miniUSB cable, which made all those problems go away.
Good luck!