Fix: Logitech K400 Plus Not Pairing to Bluetooth - itsDailyTech
wireless - Solaar (software for BT pairing of Logitech devices) is popping up with error message - Ask Ubuntu
Logitech K400 Plus Wireless Touch TV Keyboard With Easy Media Control and Built-in Touchpad, HTPC Keyboard for PC-connected TV, Windows, Android, Chrome OS, Laptop, Tablet - Black : Electronics
Logitech K400+ Keyboard Water Spill Repair – CubicleNate's Techpad
Pair Logitech Unifying Receiver Devices In Linux With Solaar ~ Web Upd8: Ubuntu / Linux blog