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After updated Virtualbox from v6 to v7 on Window 10 - I installed extension pack for v7 and then reinstalled guest additions for the guest. The guest is Debian-based AntiX with kernel 4.9. I have also installed the headers for the kernel.

However - the resolution do not change when I resize the window. I saw that no vboxdrv exists and when I try to see the modules loaded - I get this:

$> lsmod | grep vbox
vboxguest             256962  2

Any idea what could be wrong?

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2 Answers 2

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I've noticed that VirtualBox 7 does not auto resize if the VBox window size is greater than 1920x1080. Try selecting "View" -> "Virtual Screen 1," select a smaller resolution with the same aspect ratio, and scale it up as needed.

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  • thank you, I didn't know about this. However, trying to change the resolution from there does nothing :( ...
    – pesho hristov
    Commented Feb 14, 2023 at 9:05
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I decided to go with the variant to create a new VM and scp everything from the "broken" one. So I created the same VM - AntiX - and installed guest additions - and all worked as expected - I was able to change screen resolution.

However, I noticed that the kernel on the new VM is 5.10, while on the "broken" one was 4.9. So - I upgraded the kernel of the broken one - and voila! - I got the guest additions to work again :)

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