Any user that has physical access to the keyboard can simply use the Ctrl+Alt+Delete key combination to reboot the server without having to log on. Sure, someone could simply unplug the power source, but you should still prevent the use of this key combination on a production server. This forces an attacker to take more drastic measures to reboot the server, and will prevent accidental reboots at the same time.
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Today the new Ubuntu 8.10 (Intrepid Ibex) has been released. This guide shows how you can upgrade your Ubuntu 8.04 desktop and server installations to Ubuntu 8.10.

This document comes without warranty of any kind! I do not issue any guarantee that this will work for you!

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This tutorial shows how to set up an Ubuntu Hardy Heron (Ubuntu 8.04 LTS) based server that offers all services needed by ISPs and hosters: Apache web server (SSL-capable), Postfix mail server with SMTP-AUTH and TLS, BIND DNS server, Proftpd FTP server, MySQL server, Courier POP3/IMAP, Quota, Firewall, etc. This tutorial is written for the 32-bit version of Ubuntu 8.04 LTS, but should apply to the 64-bit version with very little modifications as well.
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