If you want to upgrade PostX Debian base from Wheezy to Jessie before official PostX 0.3 release (probably during late January 2016) Here is how you do it. First open a terminal client (terminator) and type the following in order to access sources.list file:
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Tag Archives: upgrading Debian
Thinking Debian: The difference between stable, testing and unstable branches
Summary: An article elaborating the differences between Debian branches. Information, along with some hints, is also given about how to upgrade and manage your system from different Debian branch to another.