Whenever I try adding printer via system-config-printer, I get the following error:
CUPS server error during operation 'Success'
(I am using OpenRC)
HP Printer
Do you have the hplip package installed ?
Because I've always had more success with my HP Deskjet using hp-setup to add the printer, than when trying to use the KDE 'Add Printer' tool.
Worth a try if you have haven't already ?
I have tried it, but I keep getting the error: No PPD found and yes, I have the hplip package installed
Is CUPS actually running ?
Have you had this printer working under Linux before?
If you run hp-setup without the GUI I believe you can supply the path to a valid ppd manually.
Maybe try using 'driverless printing' (https://wiki.archlinux.org/title/CUPS#Printer_drivers) if your printer supports it.