After the latest upgrade of Raspbian buster everything seems to be falling down. Softwares are crashing. And bluetooth adapter is missing. Also the bluetooth menu is missing. How can I fix this problem?
Are you sure the upgrade went though successfully? Try running
sudo apt-get upgrade and
sudo apt-get -f install and make sure they don't report any errors.
Next, I'd check if you can get a USB BT adapter working (if you have one). That would tell you where to look next.
If none of your adapters work, you're likely having trouble with the BT software stack. Check the status and logs of
If USB BT adapters work but the built-in doesn't, it's likely a problem in the hardware configuration. Check that BT is enabled in
config.txt and there are no conflicting settings. Have a look in the kernel log (
dmesg) for evidence that the BT hardware is detected and the driver is found and loaded. Then look for any error messages from