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Windows 10 version 20H2 (build 19042.867)
Ubunto 20.04.2 LTS
VirtualBox Guest Additions 5.8.0-45-generic srcversion 0DDD43017596C8BD051E317
Bidirectional shared clipboard enabled
Check the name of this forum: "Oracle Linux"
Nowhere in your question does Oracle Linux become involved.
I'd say your issue is with Vbox. The Vbox forum is at https://community.oracle.com/tech/apps-infra/categories/virtualbox