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How to upgrade Debian 6 to Debian 7

The following instructions are tested on 64 bit version only but should work with 32 bit system. Edit the file called /etc/apt/sources.list, enter:
# vi /etc/apt/sources.list
Find word squeeze and replace with wheezy. At the end it should look as follows:

deb http://mirrors.kernel.org/debian/ wheezy main
deb-src http://mirrors.kernel.org/debian/ wheezy main
deb http://security.debian.org/ wheezy/updates main
deb-src http://security.debian.org/ wheezy/updates main
# wheezy-updates, previously known as 'volatile'
deb http://mirrors.kernel.org/debian/ wheezy-updates main
deb-src http://mirrors.kernel.org/debian/ wheezy-updates main

To update the package list, enter:
# apt-get update

To update the minimal base system, enter:
# apt-get upgrade

To upgrade the rest of the system, enter:
# apt-get dist-upgrade

Reboot the system:
# reboot

Verify your system, type:
$ lsb_release -a
Sample outputs:

No LSB modules are available.
Distributor ID:	Debian
Description:	Debian GNU/Linux 7.0 (wheezy)
Release:	7.0
Codename:	wheezy

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