How to upgrade from Debian 7 Wheezy to Debian 8 Jessie

Posted by Humboldtux on Sun, Jul 5, 2015
In Devops
Tags debian, jessie, wheezy, update, upgrade, apt, dpkg

Some notes about upgrading from Debian 7 Wheezy to Debian 8 Jessie.

We start by creating some environment variables, that will be useful:

$ OLD="wheezy"
$ NEW="jessie"

Upgrade your Debian Wheezy to the latest packages:

$ apt-get clean
$ apt-get update
$ apt-get upgrade
$ apt-get dist-upgrade

Then, update every Apt repository file to Debian Jessie:

$ sed -i s/${OLD}/${NEW}/g /etc/apt/sources.list /etc/apt/sources.list.d/*.list

Update your packages list:

$ apt-get update

Before updating the whole system, we start by updating the core Apt packages:

$ apt-get install dpkg apt aptitude libc6

Then, do a simple upgrade:

$ apt-get upgrade

If everything looks good, continue with:

$ apt-get dist-upgrade

Reboot after your system has been upgraded:

$ reboot

Then check your “newly” system:

$ cat /etc/debian_version