Debian Squeeze (6.0) is a kind of “Old Stable” branch of Debian, the official support for this version ended in April 2014. Squeeze is still used on many servers, so a group of Debian developers decided to provide security patches…

As Debian v7.0 Wheezy has been released for a while, we will show how to upgrade from v6.0 Squeeze here step by step. Before any operations, it’s highly suggested making a backup, as least for data files and configuration files…

The upgrade between major releases for Debian system is quite easy compared to RHEL / CentOS. How can I upgrade to Debian GNU/Linux 6.0 (Squeeze) from the previous Debian 5.0 (Lenny) remotely?