Because there is no solution to this problem here I bought an external BT dongle to use it with my wireless headset for Skype. During my tries to make the internal BT to work I removed the gnome BT and installed Blueman BT. Unfortunately Blueman BT is very experimental when it has to work with a BT headset. As I am a new linux user I didn't try to connect it with my headset at all. I am looking for a solution, which works for sure with a headset. Probably Gnome BT.
So my question is:
How can I remove this Blueman BT and install another software (which one?) which works for sure with a headset?