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