May 08, 2013, 4:23 PM — Here's how you can upgrade from Debian 6 Squeeze to Debian 7 Wheezy.
1. Open a terminal window.
2. Type in the following commands then hit Enter after each.
sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade
sudo sed -i 's/squeeze/wheezt/' /etc/apt/sources.list
sudo apt-get update
sudo apt-get dist-upgrade -d
sudo apt-get upgrade
sudo apt-get dist-upgrade
For more, see the original article at the link below.
How to Upgrade From Debian Squeeze To Debian Wheezy | Linux G
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