I have tried all suggested solutions for this on the web, but none of them work in Ubuntu 18.04. Need to remap my Ctrl + C and Ctrl + V to CMD + C and CMD + V, as well as tilde character.
Did you try this here ? :
Sure, that USB-port is really under voltage ?! Or is USB-port somehow not active ?!
Plug in and out keyboard usb and what delivers command lsusb ?!
Normally usb is plug-and-play , but it can help when you reboot your machine after keyboard is plugged in.