apcupsd is a daemon which will monitor your APC SmartUPS to shutdown your system when the UPS' power is going to fail. apcupsd will work with most of APC's Smart-UPS models as well as most simple signalling models such a Back-UPS, and BackUPS-Office.

1. install the daemon:

   apt-get install apcupsd

2. edit /etc/apcupsd/apcupsd.conf and change these lines
   1. UPSNAME myownups
   2. UPSCABLE usb
   3. UPSTYPE usb
   4. comment out DEVICE (it contains a TTY link, which will prevent it from working)
3. edit /etc/default/apcupsd
   1. change ISCONFIGURED from no to yes
4. start apcupsd daemon

   /etc/init.d/apcupsd start

5. check ups status

   apcaccess status

6. install APCUPSD-CGI web interface: 

   apt-get install apcupsd-cgi

   Note: For this to work you MUST have CGI enabled in your Apache configuration and the CGI directory should be pointed at /usr/lib/cgi-bin/
7. access the web address: http://localhost/cgi-bin/apcupsd/multimon.cgi