Permissions problem installing python 2.5.4 from source

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http://askubuntu.com – I was trying to install Python 2.5.4 to my ubuntu 12.04 LTS I downloaded the package from their website Python 2.5.4 Release and I did everything they told me to, but when trying to "execute" the command: make install I get the following error message: /usr/bin/install -c python /usr/local/bin/python2.5 /usr/bin/install: cannot create regular file `/usr/local/bin/python2.5': Permiss ion denied make: *** [altbininstall] Error 1 Help will be much appreciated. (HowTos)