Since a few days there is a Raspbian version which happens on the new Debian Stretch. Anyone who wants to update an existing Raspbian to this can do so with just a few lines:
First we have to update the package lists, one command is enough:
sudo sed -i 's/jessie/stretch/g' /etc/apt/sources.list
Then we update the package index
sudo apt update
and perform the actual upgrade
sudo apt dist-upgrade
Ready.
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