With current Ubuntu 18.04 installed on focal and the current bluez v5.48 (current Ubuntu 18.04 version):
I get the following error: root@xxx:~# uname -a Linux xxx 4.15.0-88-generic #88-Ubuntu SMP Tue Feb 11 20:11:34 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux root@xxx:~# hcitool lescan Could not open device: No such device root@xxx:~# dpkg -l | grep bluez ii bluez 5.48-0ubuntu3.4 amd64 Bluetooth tools and daemons -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1870837 Title: hcitool lescan says 'Set scan parameters failed: Input/output error' To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1870837/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs