Bluetooth adapter not found.

[Ryan Xia]

I tried to enable Bluetooth on ubuntu. My laptop, a Dell Studio, is a very old model.
I got this error message, "Bluetooth adapter not found".
Can someone help me? Thank you!

[Shubh64337]

Hi, I am new here so I do not know too much about this, but can you please go into a terminal and reply with the output of

sudo dmesg | grep -i Blue

[Ryan Xia]

Hi, I am new here so I do not know too much about this, but can you please go into a terminal and reply with the output of

sudo dmesg | grep -i Blue

thank you!
The output was empty.

[Shubh64337]

Please reply with the output of sudo dmesg | grep -i Blue after running this command:
sudo modprobe btusb

[Ryan Xia]

Please reply with the output of sudo dmesg | grep -i Blue after running this command:
sudo modprobe btusb

My output was,

Code: Select all

[ 1216.650551] Bluetooth: Core ver 2.22
[ 1216.650594] Bluetooth: HCI device and connection manager initialized
[ 1216.650599] Bluetooth: HCI socket layer initialized
[ 1216.650603] Bluetooth: L2CAP socket layer initialized
[ 1216.650614] Bluetooth: SCO socket layer initialized

[Shubh64337]

Ok, so I had the same problem. There is a device named hci0, which is not in your dmesg output. I think it is not detected by your kernel. This happened with my dual boot mint installation too. To fix this, I had to switch to an older kernel, after which bluetooth started working. Can you tell me which kernel version you have? You can get it by using command

Code: Select all

uname -r

Moreover, can you provide some more details like are you using a dual boot system? What bluetooth adapter is installed on your pc? (If it is a dual boot with windows, you can check it by going to device manager in windows). In my case, I had installed Linux Mint 19.3 which has kernel version 5.0.0-32, which did not detect my Realtek bluetooth adapter. When I installed kernel version 4.19.6 and booted from that kernel, hci0 device started getting detected by kernel and bluletooth started working fine.

[Ryan Xia]

Ok, so I had the same problem. There is a device named hci0, which is not in your dmesg output. I think it is not detected by your kernel. This happened with my dual boot mint installation too. To fix this, I had to switch to an older kernel, after which bluetooth started working. Can you tell me which kernel version you have? You can get it by using command

Code: Select all

uname -r

Moreover, can you provide some more details like are you using a dual boot system? What bluetooth adapter is installed on your pc? (If it is a dual boot with windows, you can check it by going to device manager in windows). In my case, I had installed Linux Mint 19.3 which has kernel version 5.0.0-32, which did not detect my Realtek bluetooth adapter. When I installed kernel version 4.19.6 and booted from that kernel, hci0 device started getting detected by kernel and bluletooth started working fine.

I got,

Code: Select all

4.15.0-101-generic

when I typed

Code: Select all

uname -r

[Shubh64337]

Did you check which bluetooth adapter you have?

[Ryan Xia]

Did you check which bluetooth adapter you have?

I don't know, how do you check it?

[Shubh64337]

Do you have Windows installed too on your laptop?

[Ryan Xia]

Do you have Windows installed too on your laptop?

No, I have Ubuntu installed.

[Shubh64337]

Then you will have to check your computer's manuals etc. to find out the name of bluetooth adapter. Look at the underside of your laptop too, you may find the name near the battery slot.