找到如下信息，我的机器上，红色部分有效，CMOS设置就好了。
If you look through your BIOS menu you should find a setting
which allows you to enable legacy USB keyboard support. Enable it and boot
to Grub again. Now, hopefully, your USB keyboard will work.
I was running Gutsy with a USB connected keyboard for a long time and had no issues with Grub detecting and responding to it. But as soon as I upgraded to Hardy, Grub no longer
detects the keyboard. No equipment changes, only the Ubuntu version. I, too, have no option for legacy keyboard in the BIOS, but then I've never needed it with this equipment.
This same BIOS, motherboard, and keyboard worked fine on Gutsy.
Have you tried setting BIOS to someting like "USB legacy support"? GRUB
relies on BIOS calls - not OS - to load the keyboard. BTW, my USB keyboard
is useful with GRUB.
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