I had a debian box which I needed to upgrade speciffically to wheezy.
Open the sources file and change the word squeeze to wheezy
nano /etc/apt/sources.listChange the words ‘squeeze’ to ‘wheezy’
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
Save and exit
apt-get updateapt-get upgradeapt-get dist-upgraderebootJob done 🙂