Public bug reported:

The default copy of /etc/apcupsd/apcupsd.conf contains the lines

UPSTYPE usb
DEVICE /dev/ttyS0

These are incompatible with each other.  Since hardly anyone is using
/dev/ttyS0 these days to communicate with these devices, it should be
edited to

DEVICE

with a blank entry. That will force the software to auto-detect the UPS.

I kept thinking I had a bad cable or bad UPS port on the device since it
would never connect.

The comments in apcupsd.conf read:

# usb       <BLANK>          Most new UPSes are USB. A blank DEVICE
#                            setting enables autodetection, which is
#                            the best choice for most installations.

** Affects: apcupsd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1835812

Title:
  apcupsd.conf has bad DEVICE parameter

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