The issue is that keyboard stops work in guest. This mean I can press any key without effect. Same time keyboard works fine within Windows 7 pc. Mouse works fine and I able to send the shutdown command to guest within Ubuntu GUI. I tried to show the guest on host computer after keyboard stops work and see there keyboard not works either. In host itself keyboard works without any issues. I was able to solve this with shut down/load guest.This never happen immediately after guest start, but I shut down and load guest almost every day because of this issue.
I didn't find the right solution from the Internet.
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