Upgrade Debian 7 Wheezy to 8 Jessie

Pre upgrade recommendations:
– run a full backup of your running system
– remove unnecessary packages or repositories

Upgrade current running system:

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apt-get update
apt-get upgrade
apt-get dist-upgrade

Edit sources, replace wheezy through jessie:

sed -i 's/wheezy/jessie/g' /etc/apt/sources.list

Peform the upgrade to debian jessie:

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apt-get update
apt-get upgrade
apt-get dist-upgrade

Perform a system reboot:

init 6

Print distribution-specific information:

lsb_release -a