apt-get update && apt-get upgrade && echo OK
vi /etc/apt/sources.list (change "wheezy" to "jessie")
/etc/apt/sources.list
apt-get update && apt-get clean && echo OKapt-get install apt dpkg aptitude -d && echo OKapt-get install apt dpkg aptitude -y && apt-get clean && echo OKapt-get upgrade -d && echo OKapt-get upgrade -y && apt-get clean && echo OKapt-get dist-upgrade -d && echo OKapt-get dist-upgrade -y && apt-get clean && echo OK
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