bob prohaska  wrote:
> David Taylor  wrote:
>> Be prepared for some clean-up effort should you upgrade (which arguably
>> you should...).
>
> Has anybody posted a description of how to upgrade and what to watch for?
> A link would be very helpful!

http://lmgtfy.com/?q=raspberry+upgrade+jessie+stretch

First hit:
https://www.raspberrypi.org/blog/raspbian-stretch/

Summary:
Don’t upgrade! Do a fresh install.

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