I recommend using CUPS to install the printer:
- Visit http://localhost:631/admin/ in Firefox (it will NOT work in Chrome -> see cannot configure CUPS on elementary OS juno
)
- Click on Add Printer
- Login with your elementary OS user and password
- Choose your printer's connection protocol
- Click Continue
- Type your printer's path in the Connection filed
- Click on Continue
- Type a name and description
- Click on Continue
- Click on Browse, select your PPD file and click on Add Printer
You could also install CUPS GUI, from Terminal:
sudo apt install system-config-printer
system-config-printer
Hope this helps.