I'm using ubuntu 16.04 LTS and I recently acquired a Lenovo Professional Wireless Keyboard and Mouse Combo (part number 4X30H56796). I can successfully pair keyboard and mouse. Mouse works fine. On the keyboard the only keys that respond are the calculator, sound, and windows. All other keys do not work.
Can anyone advise on how to make this keyboard work?
This is finally fixed! I test it in Ubuntu 18.04 kernel: 4.15.0-64, Ubuntu 18.04.3 kernel: 5.0.0-29.
The keyboard and mouse seems to work fine with no issues! I had to disable a workaround used to make it work! https://github.com/y-trudeau/linux_lenovo_ultraslim_plus
It was also fixed in Fedora 30 according to this report: https://bugzilla.redhat.com/show_bug.cgi?id=1625415
Old answer:
There is a bug report for this: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1771431
The bug is still present in the latest Ubuntu version (18.04 bionic beaver) with stable kernel.
It's also reported by people from Linux Mint, Fedora and others.
https://ubuntuforums.org/showthread.php?t=2378862
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/
Possible workaround: https://github.com/y-trudeau/linux_lenovo_ultraslim_plus
It's now working on Ubuntu 18.04.4 with kernel 4.15.0-91 without the need for the fix provided in https://github.com/y-trudeau/linux_lenovo_ultraslim_plus