Read your motherboard manual and check the BIOS settings for the wireless keyboard.
With my Logitech wireless keyboard the Enter key will not work to enter my password when I boot (for my persistent storage). However once I am into Knoppix the keyboard does work. I just can not enter my passwood and have to switch to an old wired keyboard to do so. Does anyone know any solution to this problem?
Read your motherboard manual and check the BIOS settings for the wireless keyboard.
usb keyboard legacy support is enabled in the BIOS. Unfortunately I don't have my motherboard manual.

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