logitech k480 bluetooth in linux

its ok

I set keyboard in paired mod
then in terminal:
$ bluetoothctl 
[NEW] Controller 00:02:72:DE:1E:41 debi [default]
[NEW] Device 00:1F:20:EC:A5:DD Logitech Keyboard K480
[NEW] Device 00:1A:7D:55:02:06 BS-55
[NEW] Device A0:8D:16:86:81:C1 CHM-U01
[bluetooth]# connect 00:1F:20:EC:A5:DD
[bluetooth]# trust 00:1F:20:EC:A5:DD
[bluetooth]# quit

thats all 
it work

find here https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1492441

As a workaround I managed to pair successfully following the instruction in the "Pairing process" section at
https://wiki.archlinux.org/index.php/Bluetooth_keyboard
i.e.
sudo bluetoothctl -a
power on
agent KeyboardOnly
default-agent
pairable on

enter pairing mode on the keyboard

scan on
pair MAC_OF_THE_KEABOARD_FROM_PREVIOUS_STEP

I think now I had to enter the displayed pin on the bluetooth keyboard and press enter

trust MAC...
connect MAC...
quit
The keyboard stays connected even after the system restart.

I've connected using the MacOS mode from the keyboard w/o going through all of these steps.

Although, I did go through the following steps and then I gave up and tried connecting the keyboard using MacOS mode:

1. sudo apt-get update
2. sudo apt-get install bluez [NOTE: bluez-utils is deprecated]

After the above 2 steps, I've used the Ubuntu [18.04] UI to connect my Logitech K480 Keyboard using MacOS mode.

worked with Ubuntu 21.04 in macOS mode out of the box without the need of any extra packages

Works,thanks!
Used hcitool scan to get MAC-address of bluetooth keyboard