[ubuntu] Replacing Windows 2000 server with ubuntu server steps?

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http://ubuntuforums.org – Hi guys, Currently our windows 2000 server provides Active Directory,DNS and DHCP services for my small office network. Also there is an ubuntu server 10.04 that provides samba, proxy (squid) and firewall (shorewall) for the whole network. The windows 2000 server has being giving a lot of problems regarding performance and service availability (it fails almost every day) so I want to move all of the services the Windows Box provides to my Ubuntu Box (which runs perfectly atm :D) I have succesfully setup the DHCP server on the ubuntu machine (I set it as authoritative), although I haven't d (Hardware)