Debian Linux: Upgrade v6.0.x Squeeze to v7.0.0 Wheezy

To upgrade a Debian Linux system from version 6 (Squeeze) to version 7 (Wheezy), follow these steps:

1. Update the package lists and installed packages:

sudo apt-get update
sudo apt-get upgrade

This will ensure that your system is up to date before beginning the upgrade process.

2. Edit the /etc/apt/sources.list file to point to the Wheezy repositories:

sudo nano /etc/apt/sources.list

Replace all instances of squeeze with wheezy in the file. For example:

deb http://ftp.debian.org/debian wheezy main
deb-src http://ftp.debian.org/debian wheezy main

deb http://security.debian.org/ wheezy/updates main
deb-src http://security.debian.org/ wheezy/updates main

Save the file and exit.

3. Update the package lists again:

sudo apt-get update

4. Upgrade the system:

sudo apt-get dist-upgrade

This will upgrade the system to Wheezy and install any necessary dependencies.

5. Reboot the system:

sudo reboot

After the reboot, your system should be running Debian Wheezy.