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What ever I type on Ubuntu(after minimizing windows 10 guest window) it get typed in Windows 10. Virtualbox version is 6.0_6.0.22-137980. Mouse is working properly in host machine. Can anybody help me to make keyboard work parallelly on both guest and host machine.

Sounds like you might have a USB filter in the guest that matches the host keyboard. This would stick the keyboard into the guest only.

See USB basics and troubleshooting to see how these filters are made and how to check if you have one.

Hi @scottgus1. Thanks for you reply. I removed and reinstalled virtualbox and now keyboard is working parallelly. After reading your message I added only 2 usb which were important for me (2 pendirves) instead of 4(previously). May be you are right. Thanks.

The number of pen drives was not the issue. The issue was a USB filter that was specified too broadly, meaning that the host keyboard matched the filter, got grabbed and ownership assigned to the VM. Naturally this will stop the keyboard from working.

Hi @mpack, may be you are right. But I never added USB filter while selecting my usb drives. However I also don't know how to add it. Does it added automatically ? or user intentionally add it ?

USB filters have to be intentionally added. I don't think using the on-the-fly USB grabber in the guest window status bar causes a filter.