Guest addictions on VirtualBox not working

[kensan]

Hi,
I have read that VirtualBox (VB) on Mageia is a fork of Oracle VB: https://www.virtualbox.org/ticket/18910

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$ VBoxManage -version
7.0.4_Mageiar154605


So I have install via Mageia Repository VB 7.0.4 and Guest addictions 7.0.4. I have the latest Mageia and updated.
I have installer Win10 on VB (Gest) and when started Win10 on the bottom of the window i clicked on Shared folder and the message is:

The VirtualBox Guest Additions do not appear to be available on this virtual machine, and shared folders cannot be used without them. To use shared folders inside the virtual machine, please install the Guest Additions if they are not installed, or re-install them if they are not working correctly, by selecting Insert Guest Additions CD image from the Devices menu. If they are installed but the machine is not yet fully started then shared folders will be available once it is.

Shared folder is setted. The same for shared clipboard and drag'n drop: don't works and are setted. So I suppose that Guest Additions are not properly installed: must I download VB from oracle instead of Mageia's fork? Or only Guest Additions ISO?

[sturmvogel]

Is your user is in the group vboxsf?
And did you install the guest-additions on your Windows guest as described here:
https://wiki.mageia.org/en/VirtualBox#On_guests

[kensan]

Is your user is in the group vboxsf?

No, I have now added myself to this group:

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$ who am I
sandro
# usermod -a -G vboxsf sandro


Is ok or I have to used the windows' user vbox (C:\Users\vbox)?

And did you install the guest-additions on your Windows guest as described here:
https://wiki.mageia.org/en/VirtualBox#On_guests

For Microsoft Windows guests, after install, in the running guest virtual screen window: menu Devices -> Insert CD image of guest additions, and have the guest install it. (VirtualBox may download it automatically from Oracle if needed.)

Now I have restarted VB, start Win10 and try to download Guest addictions, the message that I obtain is:

Name: VBoxGuestAdditions
During certificate downloading: Unknown reason

I see a immediate 100% in the progression bar.
I click on a shared folder on the bottom of the window:
«The VirtualBox Guest Additions do not appear to be available on this virtual machine, and shared folders cannot be used without them.»
Restart the VM but nothing change.