Why ubuntu software center doesn't have the latest version of softwares? [duplicate]

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http://askubuntu.com – This question already has an answer here: Why don't the Ubuntu repositories have the latest versions of software? 7 answers Say I want to install Codeblocks(C/C++ IDE) using Ubuntu Software centre. But, if I do that I will install version 10, when I can have version 12 if I download package from Codeblocks website. The same happens with Eclipse. Ubuntu software centre has ve (HowTos)