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Think you found the answer already, but for the others:
This error usually occurs if you start the apcupsd twice. If "/etc/init.d/apcupsd stop" doesn't delete the Lockfile, then "joe /var/lock/LCK*" (or what ever the name of the Lockfile is)schows you the PID of the previous apcupsd-process. With "ps -p PID" you look up if it's really a apcupsd running. Then "kill PID"(the one you found out above) schould do the trick. Then "/etc/init.d/apcupsd start" schould be able to create the Lockfile.
I'm having the same problem, and there's no instance of apcupsd running. It never gets off the ground--during boot when the process would start, I get the same message "unable to create USP lock file."
OK, I figured out how to make apcupsd work again. I found various references via Google and it seems there's a bug in the apcupsd software that makes it not release a lock file after a power failure. I had tested it by pulling the power plug (=power failure) and the system shut down properly via apcupsd, very nice. But upon rebooting apcupsd would not start again because of this error--the lockfile still existing.
I deleted the file named /var/lock/apcupsd and then I was able to restart apcupsd.
Now if I only knew how to make that happen automatically next time the power goes out or I test the thing!
But at least that is one way to get it running again.
All right, here's how I got this situation fixed on my Mandrake 9.2 system.
I edited /etc/rc.d/init.d/apcupsd by inserting the line:
rm -f /var/lock/apcupsd
case "$1" in
where there are two pre-existing lines with rm commands.
That worked. I tested it by pulling the plug from the wall. After the five-minute interval I'd set in the configuration file, the system shut down correctly; I then powered off the USP as the program instructs you to, and restored the mains power, powered on the USP, the computer rebooted and USP monitoring is in place again.