I use a Back-Ups RS 500 which is fed on two servers (Windows Server 2003 & an ubuntu server). I installed the PowerChute software on the Windows server. How to communicate to any server linux power outage so that it stops itself? Are there any dual cables DATA / USB ?
Currently there are no dual cables available. Having one communication port is a limitation on the smaller Back-UPS units, which aren't really designed to handle multiple computers. Also, I don't believe APC has any software that supports Ubuntu... So you may want to check out some third party software, like apcupsd.