I've installed 12.04 (server). I'm now trying to configure web sites, emails, services, etc.
How do I do this?
This looks like is too vast to attempt to answer in AskUbuntu.com as it differs for each case asked for. However let me attempt to give some overview and on what needs to be done and I given a link to "Ubuntu 12.04 server guide" for referring to details on "How To". If any of those are confusing, please post diffe
For websites, you need to configure apache.
For email, you need to some thing like postfix configuration (or other email servers you like a different once)
To configure services, you need to review update-rc.d command to change the current default startup and shutdown commands.
For a detailed how to on each of these, please refer to 12.04 server guide here