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My Toshiba laptop running Kubuntu 18.04 doesn't recognize the Bluetooth adapter after a fresh start up. After restart it works. Symptoms are like this :

$ sudo rfkill list

0: Toshiba Bluetooth: Bluetooth
        Soft blocked: no
        Hard blocked: no
1: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
2: brcmwl-0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
3: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no

yet the Bluetooth widget says : "no Bluetooth adapters found" enter image description here

I found two solutions :

  1. restart the machine
  2. execute the below script
sudo rfkill block bluetooth
sudo rfkill unblock bluetooth

What might cause this and what is the best way to make it work after a fresh start up?

1 Answer 1

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I tried various things like go into BIOS, turn off WiFi and Bluetooth, restart, turn them on and boot into the system; reload Bluetooth services; edit some configuration files, etc. But what helps in my case is to tell the kernel to reload the btusb module.:

sudo modprobe -r btusb
sudo modprobe btusb

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