How to upgrade Debian 8 (jessie) Debian 9 (stretch). 

    apt-get update && apt-get upgrade && echo OK

     

    vi /etc/apt/sources.list
    (change "jessie" to "stretch")

    apt-get update && apt-get clean && echo OK

apt-get install apt dpkg aptitude -d && echo OK

apt-get install apt dpkg aptitude -y && apt-get clean && echo OK

apt-get upgrade -d && echo OK

apt-get upgrade -y && apt-get clean && echo OK

apt-get dist-upgrade -d && echo OK

apt-get dist-upgrade -y && apt-get clean && echo OK

     

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