I have an ubuntu 18.04 that has an "ASUS PCE-AC55BT B1 AC1200 Wireless Bluetooth 4.2 PCIe / Mpcie Adapter". The wifi and bluetooth worked fine for a couple of months, but recently the bluetooth has been broken (wifi still works).
I am pretty sure that I have tried all the results on the first 3 pages of Google when looking for this problem, but I can't understand why bluetooth doesn't work. I have spent over 8 hours trying to fix this annoying problem, so I would be very grateful if someone can help.
Here is more information and things I've tried.
I have a dual-boot PC (Windows 10 and Ubuntu 18.04). The bluetooth doesn't work either and the wifi works on both. This makes me think that there is something wrong at a very low level (hardware drivers or BIOS).
I've even tried buying a replacement for my old wifi / bluetooth adapter of the same model because I thought maybe the bluetooth was broken for some reason. The new one also has the same problem. I have tried moving the card to a different pci slot with no luck. This means that the hardware is not broken.
The problem seems to be in the fact that no Bluetooth adapter is detected. When I make the rfkill list, I only see wireless LAN, but not bluetooth.
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
When I run systemctl status bluetooth, I get
bluetooth.service - Bluetooth service
Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
Active: inactive (dead)
I have also confirmed that I have the latest versions of bluez, bluetooth and bluez-tools.
When I try to run Bluetooth Manager, I get an error
Bluez daemon is not running, blueman-manager cannot continue. This probably means that there were no Bluetooth adapters detected or Bluetooth daemon was not started.
I tried to start the bluetooth daemon with both lines, but systemctl status bluetooth still shows bluetooth as inactive (dead) after these commands.
sudo service bluetooth restart
sudo /etc/init.d/bluetooth start
( ok ) Starting bluetooth (via systemctl): bluetooth.service.
Honestly I'm not even sure what to try as nothing seems to work. The weirdest part for me is that the bluetooth worked fine for a couple of months and then it stopped working. The only thing I remember changing was setting acpi = force in / etc / default / grub, but I removed it later when I discovered that bluetooth was not working. I'm not sure if this is correlated since I didn't try bluetooth just before / after.