Many thanks Brent for the prompt reply!
I had to do practically nothing to configure the printer in Solus: in the System Settings - Printers I found it already identified as "Canon_MB2700_series".
I just checked "default printer" and, rightly, selected Make/Model to indicate the exact model (Canon MAXIFY 2750 - CUPS+Gutenprint v.5.3.4).
So far, I have been pleasantly surprised by Solus.
N.B.: it is not nice, however, that every time the system starts up you have to repeat the printer selection. But I don't know what to do other than clicking on "Save" and "Apply" to make the choice permanent.
I did not think of trying to indicate a different model, there are hundreds of them and it seems highly impractical to try all the options, as well as not very useful.
However, I also tried the "Simplified" version of the same entry: no practical difference.
It goes without saying that the first thing I tried to do was to change the long/short edge option. It is useless at all. It almost seems that the long edge option is ignored. Since this printer functionality, making a very simple topological reasoning, can only work in one way, that is by pulling the sheet back and reinserting it under the head on the other side, mechanically they are all the same, and the software must also provide to "turn" the print in the right direction which is always the same, so it cannot be that some printers turn the page evenly in one way and others in the other way. The thing does not change. It is clearly a defect. Maybe it is just a trivial line in a script. Who knows!
The "canon-ufriilt-common" driver was already installed. Evidently it installed itself automatically. Great Solus! What a shame that then there are these little inconveniences.
I tried to download the driver sources from the Canon site. There is nothing that explains how to use them. It seems that it is only possible to compile them as DEB or RPM. However, I do not feel bold enough to start tinkering with the operating system heavily. It took me two whole days to get almost everything to the way I want, I would not like to have to do everything again.
I look forward to further suggestions...
