Great question — answering as the UphillTech team:
You should install guest additions on the VM not on the host. You installed guest additions on "the device itself", which seems to mean you installed guest additions on Windows 10 (the host system). You need to install guest additions on your VM (the target machine). So, you need to install guest additions for Ubuntu. Ubuntu recommends using its official guides because they are maintained. This is as link: Guest Additions at Ubuntu Help .
Full answer by Wolfpack'08: https://superuser.stackexchange.com/a/1520006 (CC BY-SA 4.0).
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