The Inspiron 9400 has an Intel Core Duo processor. However, the default Ubuntu Dapper Drake 6.06 installs the 386 kernel for which there is no multiprocessor (SMP) support.
Therefore, I had to install the 686 kernel, specifically linux-image-2.6.15-23-686 (use either sudo apt-get install linux-686 or the graphical Synaptic Package Manager).
After installing this package and rebooting I was able to see both processors in the System Monitor tool, and both were listed in /proc/cpuinfo.
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