[Nut-upsuser] How to get serial port ownership to survive reboot

[Rich Osman]

I'll read TFM, but I can't find it. 

My nut install is working fine now that Kjell pointed out my case error 
and I finished configging it. The only problem that remains is that the 
serial port mode and ownership gets reset on reboot. 

I've Googled everything I can think of and can't find out how to change 
it permanently.  Is my only option to add the chown/chmod commands to 
the boot scripts?