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I've updated VirtualBox and now I cannot see the VM console. How can I fix it?

I've updated VirtualBox and now I cannot see the VM console. How can I fix it?

If you have upgraded VirtualBox, you will need to also upgrade the VirtualBox Extensions Pack, otherwise you will not be able to see again the Virtual Machine Console. After upgrading the extensions, cancel the running WU and request a new one, this will allow T4T to configure the VM correctly with the new extensions.