@david martin
Most things are possible but not for the faint-hearted. The comment from the previous post
...but it does help if the gutenprint files have been previously installed and working.If you want reasonably stress-free then python 2 support can be added to the Ubuntu 20.04 Gimp 2.10.20 see:
https://www.gimp-forum.net/Thread-Heal- ... 4#pid18354 Not needed for gutenprint but it does give a fully functioning Gimp. Then use a regular Gutenprint install.
As it happens, I decided to put (k)ubuntu 20.04 on my desktop computer. It is not as 'compliant' as earlier 'buntus, not so easy to get old applications working but that is my love of 'old-stuff'. Another decision, only going to use the Appimage Gimp.
Yesterday it came to installing my old Brother J825DW inkjet / scanner. The printer side was not too bad, even though the printer drivers are 32 bit, scanner was a PITA but eventually got it scanning from Gimp 2.10.20 appimage.
Just a note about the appimage, for various reasons (using --verbose mode switch) I unpack it and run it as a permanent installation from disk. Still uses the regular Gimp profile in ~/.config/GIMP-AppImage/2.10/
Today spurred on by you, came Gutenprint. I know it works from my laptop (kubuntu 18.04, wireless connection) For the desktop a USB connection.
First your printer .ppd file. AFAIK that should go in etc/cups/ppd
Some of the gutenprint files can be installed from ubuntu libgutenprint2 is required. Gimp-gutenprint is not possible this way, it has Gimp as a dependency, that will install a regular Gimp, so unpack the deb and put the gutenprint plugin in your Gimp User plug-ins folder.
Does it work? Well it does here but there are any number of things that can (and will) go wrong. Very much up to the user.