Hello fanthom. The best estimate about what is going on seems to be given from one of my comments on the post you cite:
Thanks for reporting your experience. You give us food for thought. Maybe I was on the wrong path, but I am not that sure. It might be possible that gutenprint-ghjostscript is not compatible with the actual cups version. Some more testing will be needed. Unless we get testimonies from others, and this might be the case for cttan.
Bjornar observation would mean that the (HOW TO) CUPS: adding lpr and cupswrapper drivers is still the way to go for now with porteus 2.0:
Until the issue with gutenprint-ghostscript method with CUPS could be debugged. On my part, I will not be able to look at it before the weekend.
Have you been able to install some printer with the gutenprint and ghostscript packages using porteus version 2.0?
The answer from cttan was:
Yes. I am still able to use gutenprint driver and ghostscript to print to my Canon MP145 USB printer.
As for my office printer, currently it is Konica Minolta C420 copier+printer which I use the driver from Konica Minolta website. The step to insert the printer is shown in above post.
And I imagine that cttan meant that he was working with porteus 2.0 though he did not mention it.
I cannot explain why blaze and EdP and tadatma are not able to get their printer to go for now:
I would need to work on the different solutions: installing single printer drivers, installing printer drivers thru gutenprint-ghostscript once more. I know that it bugs when I use the gutenprint-ghostscript solution for me since porteus 2.0. The problem is that I have b stuck in a period of overwork in the last few weeks.
Cttan is really good at it, he seems to know more than me or at least he has some knowledge I do not have.
Conclusion: maybe the problem is with gutenprint or ghostscript.