keyboard issue in virtualbox

[Shuai Yu]

Hey, Guys

I have keyboard problem in virtualbox guest machine. It stops working in guest machine. 
I could not type anything in guest machine even in installation process. 

Anyone has any suggestion for this?
Virtualbox: 1.5.6
Ubuntu: 8.04beta 2.6.24-15-generic

Thanks,
Shuai
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