How do I install a package from Ubuntu Karmic onto Jaunty?
Solution 1:
You can use non-standard packages in Ubuntu. You have to take care of the dependency resolution yourself.
You can download the package from the link in your questions.http://packages.ubuntu.com/karmic/libapache2-mod-wsgi
After you download, you can install with sudo dpkg -i or gdebi the gui .deb installer.
You may have to download additional a packages to resolve dependencies.
Solution 2:
One uses "apt pinning" to do this. An example is given here http://osdir.com/ml/ubuntu-users/2009-06/msg00516.html, you'll have to review the man page and adjust this to your needs.