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Re: Error while upgrading from Wheezy to Stretch

David Parker wrote:

  given they are test boxes you should go straight
to reinstall from netinst image or whatever you can
get that will do it.  :)

  much much faster than trying to fiddle around with
upgrades.  especially when many versions in between.

  of course, always check installation notes for 
errata and look to see if there are a lot of issues
reported for your specific hardware.