First at all, you should have the uncompiled version

, because there isn't a compiled version for Kubuntu. Another important thing is to have the kernel hearders installed in order to compile your driver.
After that, you just need to read the readme.txt

file to see this:
6 steps to install
1. login as ROOT
2. extract the archive into a directory with "tar -zxvf <archivename>.tgz"
3. cd into the directory it created.
4. Type: make clean
5. Type: make 537
6. Type: make install
This will create a /dev/modem device file. This file is used as an interface to
modem by all applications: minicom, kpppd, efax, etc. Please configure the applications
to use /dev/modem if neccessary.
I hope you can install your driver succesfully
