I just installed the dotlrn-2.0.3 tarball and it works fine.
You aren't installing the tarball on top of something else are you? Start with an empty database and empty filesystem and untar the tarball. The tarball contains the kernel datamodel also. Installation should run all the way to complete installation of all packages after you have given your basic information (without having to click another "next").
Otherwise, there may be something wrong while executing "apm_source".
The installer is in ./packages/acs-bootstrap-installer/installer.tcl if you want to follow what is happening. packages_install.tcl should be in ./packages/acs-admin/www/apm/
Is your config file correct? Is the serverroot correct? Are the permissions correct?