It seems that ubuntu 9.10 has quite a different set of supporting libraries. As a result, it is not possible to transfer the installation processes from 9.04 to 9.10.
For example, installing DB2 9.7 cannot be done without getting certain libraries before the start.
In my installation, I had to
$ sudo apt-get install libaio-dev
For example, if you try the instalation without this library you will get the following error message:
The required library file libaio.so.1 is not found on the system.
Check the following web site for the up-to-date system requirements
of IBM DB2 9.7
Aborting the current installation ...
Run installation with the option "-f sysreq" parameter to force the installation.
With the aforementioned library in place you can install the product with:
$ sudo ./db2install