Keyboard is sending extra byte with each key-press, as temporary workaaround 
you can use mapping in this repository (tested on Fedora 28 with 4.20 kernel)
https://github.com/miskopo/lenovo-professional-wireless-kbd-linux-driver

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https://bugs.launchpad.net/bugs/1771431

Title:
  Lenovo Essential Wireless Keyboard doesn't works (Primax Electronics
  manufacturer)

Status in linux:
  Confirmed
Status in linux package in Ubuntu:
  Triaged
Status in linux package in Fedora:
  Unknown

Bug description:
  Hi
  I got an issue on Ubuntu 18.04 with latest packages.
  uname -a:
  Linux MyLaptop 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux

  lshw:
                *-usb:0
                     description: Keyboard
                     product: Lenovo USB Receiver
                     vendor: Lenovo
                     physical id: 3
                     bus info: usb@1:3
                     version: 1.05
                     capabilities: usb-2.00
                     configuration: driver=usbhid maxpower=100mA speed=12Mbit/s

  My wireless keyboard is not working, Ubuntu only recognize some
  special keys (Super, Ctrl, Shift, Alt)

  This is a Mouse+Keyboard combo using a wireless receiver by usb:

  lsusb:
  Bus 001 Device 005: ID 17ef:609b Lenovo

  Mouse works fine, and in Windows 10 it works with no issues.

  I found multiple reported problems with this keyboard in other distros (and 
from Asus too, as the real manufacturer is Primax Electronics).
  
https://forums.lenovo.com/t5/Linux-Discussion/Professional-Wireless-Keyboard-not-working-on-Linux/td-p/3726486
  https://ubuntuforums.org/showthread.php?t=2378862
  
https://askubuntu.com/questions/897729/lenovo-professional-wireless-keyboard-and-mouse-combo-not-working-in-ubuntu
  
https://forums.linuxmint.com/viewtopic.php?f=49&t=260093&sid=20a073d5dd8abb1b7f23be608d7fdfd7
  
https://unix.stackexchange.com/questions/377830/linux-hid-driver-for-primax-wireless-keyboards/

  REPORTS ON KERNEL MAILING LISTS:
  https://www.spinics.net/lists/linux-usb/msg168719.html
  https://www.spinics.net/lists/linux-input/msg56210.html
  https://www.spinics.net/lists/linux-usb/msg173012.html
  https://www.spinics.net/lists/linux-input/msg58221.html

  There is a workaround (I still didn't tried) but it needs to compile an 
specific driver.
  https://github.com/y-trudeau/linux_lenovo_ultraslim_plus

  There is already a kernel report about this.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-generic 4.15.0.20.23
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  julian     1342 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Tue May 15 15:53:41 2018
  InstallationDate: Installed on 2018-05-14 (1 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  MachineType: LENOVO 20FJS0NT07
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-20-generic 
root=UUID=818481db-36cb-4dba-8da5-8ecf15750b3b ro noapic acpi=off vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-20-generic N/A
   linux-backports-modules-4.15.0-20-generic  N/A
   linux-firmware                             1.173
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/27/2018
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N1KET38W (1.25 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20FJS0NT07
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40705 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN1KET38W(1.25):bd03/27/2018:svnLENOVO:pn20FJS0NT07:pvrThinkPadT560:rvnLENOVO:rn20FJS0NT07:rvrSDK0J40705WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad T560
  dmi.product.name: 20FJS0NT07
  dmi.product.version: ThinkPad T560
  dmi.sys.vendor: LENOVO

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