Logitech K380 Wireless Bluetooth keyboard, multi-device & Easy-Switch feature, Windows and Apple Shortcuts, PC / Mac / Tablet / Mobile Phone / Apple iOS + TV, US QWERTY layout - White: Amazon.de:
For those of you who haven't found the solution to the reversed Fn key on Logitech K380 : r/Ubuntu
Logitech® K380 Multi-Device Bluetooth Keyboard -Black – Shift Store
Logitech K380 / Easy-Switch for Upto 3 Devices, Slim Bluetooth Tablet Keyboard - Logitech : Flipkart.com
How to Install Blueman Bluetooth Manager on Ubuntu? - TechSphinx