UPS Compatibility with Ubuntu Server

I'm looking into getting battery backup unit to protect my Ubuntu server. How can I find out if it is compatible with Ubuntu (11.04)?

Ideally I'd like to be able to tell the server when there is a power outage so the server can shutdown. I know most of them come with software that works with Windows, but haven't seen any that mention Linux or Ubuntu.

Are there any good resources for setting up UPS's with Ubuntu? Any recommendations?

One of the most popular UPS companies is APC.

To monitor and powerdown my server I have been using apcupsd which has lots of options and a comprehensive userguide for setting it up. It has worked well with my APC Smart-UPS 700VA for many years.

You may find that you need to spend a bit more to get a UPS unit that has a serial/usb cable to communicate power status with the server.