I just installed 12.04 (dual-boot, kept Windows just in case) on my DELL inspiron 1545.
- The hardware is on (and working fine under Windows) The icon shows up on the menu, giving me the options of turning Bluetooth on or off, and then just "Bluetooth preferences".
- I can apparently turn it on that way, which only lights up the icon but makes no difference at all (and doesn't give any other options in the Bluetooth menu)
- When I open "Bluetooth preferences" (whether Bluetooth is apparently on or off, it makes no difference), it says it's disabled and will not let me slide the button to enable it.
I have also tried this commands:
sudo rfkill unblock bluetooth
sudo service bluetooth start