Yes, I did install the guest additions - I always do. I use virtualbox
quite a lot and have been really pleased with it - up to a few weeks
ago. The fact that it seems to cause file corruption in some
circumstances is very worrying :(

On Tue, 2022-10-18 at 23:09 -0700, Gregory Nowak wrote:
> On Tue, Oct 18, 2022 at 11:52:42AM +0100, Peter Duffy wrote:
> > I tried gunzipping the
> > file on the VM, and on a separate physical box with the same
> > version of
> > gunzip, then comparing the md5sums of the files: original - md5sum
> > matches; unzipped file - md5sums didn't match. I then wrote a
> > little
> > prog to scan for binary zeros, and ran it on both files: not there
> > in
> > the one done on the physical box; there in the one done on the VM.
>
> Did you install virtualbox guest additions in the guest? If not, do
> that, and try it again.
>
> Greg
>
>