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Are you running v5.0 on your Syno?
Where did you get a package from?
I don't think it would work. But you can try it with my commands. Just change the filename in "./VBoxManage extpack install --replace.
If something goes wrong you can switch back with the same commands to an older version of...
A quick fix for Windows 10 clients not connecting to a VRDP Session do following.
It works perfect for me. No other issues are caused by doing this,
Shutdown running VM's
Stop Virtualbox in Packetmanager
SSH to your DS
cd /opt/VirtualBox
wget...
