Unable to choose GRUB menu choice after reboot

I've discovered a weird problem with my Linux Mint-system (Linux Mint 18).
After rebooting my system (or restarting as well) I got the GRUB menu, but my keyboard is not responding...
So I have to wait for the timeout to get my system booted.

The keyboard is wired to the computer through an USB-connection. So it's not wireless.
And it works OK as soon as my system has booted.. (?).

I have installed/loaded Linux kernel 4.4.142, 4.4.143 and 4.4.145.
When running kernel 4.4.142 Virtualbox and VMWare Workstation works as it should, but when I try to use 4.4.143 or 4.4.145 they both refuse to load.
So I want to be able to choose which kernel to run depending on what I want to do.. :-)

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