hcitool lescan shows I/O error

Question

I\'m trying to do a lescan using hcitool on the raspberry pi.

The command prints out

Set scan parameters failed: Input/output error. 

Answer 1

I have removed Bluez and then I just installed it again, and it worked for me:

sudo apt remove --purge bluez bluez-* -y


apt install bluez

And then

hcitool lescan 

That should be enough.