Another way to install extra Python package is by source.

1. Install the build-essential and gcc.

• sudo apt-get install build-essential gcc

 

2. Go to your target installation directory (usually i put them in /usr/local), download the source file.

• wget http://www.python.org/ftp/python/2.5.6/Python-2.5.6.tgz

 

3. Extract the source archive.

• tar -xvzf Python-2.5.6.tgz
• cd Python-2.5.6

 

4. Build and install.

• ./configure –prefix=/usr/local/python2.5
• make
• make test
• sudo make install

 

5. In the above steps, you may encounter the missing dependencies error such as

• ImportError: No module named _sqlite3

 

6. In that case, install the missing dependencies.

• apt-get install libsqlite3-dev
• apt-get install libbz2-dev

 

7. After the installation is completed, create the symbolic link in /usr/bin for the new Python 2.5.

• sudo ln -s /usr/local/python2.5/bin/python /usr/bin/python2.5

 

Done =)

Reference:

• Howto: Install Python 2.5.5 on Ubuntu 10.04 Lucid Lynx
• StackOverflow – No module named _sqlite3
• Python – Install a Python2.5 on Ubuntu Lucid @ 1