>BTW: How do you verify that the hash sum is the correct one?
>If you just download the file from somewhere in the internet and take that 
>hash sum to verify the >same file, it's not of much use, from a security point 
>of view. It just proofs that it is the very >same file again, but not, that it 
>is the original file. Smells a little bit like snakeoil security.

I take the hashes from the https secured upstream download repository,
and verify them with md5 sha256 after downloading in https the ext-pack
itself.

the hash validated by me, is then hard-coded in the postinst file, and signed 
with my personal GPG key, so it is not tamperable anymore.
you can see hashes by yourself if you want.
https://download.virtualbox.org/virtualbox/5.2.10

G.

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https://bugs.launchpad.net/bugs/1767402

Title:
  [SRU] hash mismatch or wrong accept-license key trying to install
  virtualbox-ext-pack 5.2.10

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