tx files from mobile to ubuntu/linux laptop
As described above sending files from your ubuntu laptop to your phone is easy using the send via bluetooth function, as long as you have set up your device under "set up new device" ensuring the phone has bluetooth on and visible.
To send files the other way I browse my phone through ubuntu bluetooth
If yor right click oin the bluetooth icon, select "browse files on device" this can take a shortt while for it to read files. if you then open a file manager or click on computer you will see your device and you can copy files as required.
Hopefully this should work, it works with my N97