I just recently installed UBUNTU 2.6.24-16 and i installed my phone software which is a RPM package (it's a similiar package with MSN).
The software called MXIE.
I managed to install it successfully but i can't run the software.
When i try to run it, i received /usr/local/zultys/bin/mxie: error while loading shared libraries: libstdc++.so.5: cannot open shared object file: No such file or directory
If you run into more of these, Ubuntu -- Ubuntu Packages Search lets you find which package provides a particular file. You can also install apt-file if you prefer to run the search on the box itself (might be useful if you have a laptop which is only sometimes connected to the Internet).
By using an rpm, you have not made the system check for dependencies. You are now going to have to supply the packages that satisfy the dependencies for the package you installed, and any sub dependencies that they have.
This is a tedious process. It would have been better if you had run alien on the rpm to create a .deb package. Then, your package manager would likely have traversed its repositories to satisfy dependencies for you.