VirtualBox: Error when downloading the guest additions

Certificate error when downloading the guest extensions.

After updating VirtualBox, the software offered to ask me if I would like to update the guest extensions for my virtual machine. Fine, why not?

Stupidly, the download also failed. Certificate error.

VBoxGuestAdditions
During certificate dowloading: Unknown reason

My VirtualBox version is the new version 7.0, but the problem seems to have plagued users regularly in the past as well.

The solution to the problem was to download the ISO file manually. For all versions of VirtualBox, the corresponding ISO files are available for download on the server.

Here I have downloaded the one suitable for my version. We then integrate the ISO file into the virtual machine and can then install the guest extensions.

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