Corrupted tar-ball in Cygwin-x86_64

[Angelo Graziosi]

When I try to update my Cygwin64 installation (on a virtualBox Win7-64 
installation) I get an error about the cygwin32-1.7.27-1.tar.xz package 
which seems corrupted.

This is confirmed from command line on which i get:

$ tar -rf cygwin32-1.7.27-1.tar.xz
tar: Impossibile aggiornare archivi compressi
tar: Error is not recoverable: exiting now


Ciao,
  Angelo.

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