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Just a word of advice to anyone installing Virtualmin on Debian 6 Squeeze via PuTTY; it may appear to hang, near the end during the installation of virtualmin-base, never returning to a prompt, but if you check /root/virtualmin-install.log at the terminal, you'll probably discover that the installation was successful just requiring a reboot.
This frustrated me over several reinstalls before I thought of checking the log.