systemctl start apcupsd.service
Cannot create /etc/apcupsd/LCK.. serial port lock file: ERR=Permission denied
apcupsd FATAL ERROR in apcupsd.c at line 285
Failed to acquire device lock file
It starts if I change "LOCKFILE /etc/apcupsd" to "LOCKFILE /var/lock" in /etc/apcupsd/apcupsd.conf, like in F19 or F20.