I confirm that After running smart --gui the error appears. The solution is to sudo apt-get install python-rpm.
The similiar error is described here https://launchpad.net/distros/ubuntu/+source/smart/+bug/3570 -- smartpm missing dependency -- python2.4-rpm https://launchpad.net/bugs/47788 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
