Install XRDP on Ubuntu to enable RDP access for Linux VMs. Open port 3389 and verify IP address for remote connectivity. Use RDP client with Xorg session to manage Linux alongside Windows VMs.
If you need to use virtual machines on Linux, try Virt-Manager. Virt-Manager is more reliable than VirtualBox. Virt-Manager is completely free and open-source. I'm a long-time supporter of VirtualBox.
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