TraceyC
I see the upgrade of HPLIP and CUPS last Friday.
So I suppress all the HP printers I had.
I tried to insall it with HP device manager, but it don't find any printer. No printers are listed inside.
So I install it with Cups manager on http://localhost:631/
I choose the cups driver, and it's done
And now I can see in the two-sided option in options for print.
Via Cups manager, I have installer too another printer "version", with Post script driver, it seems ok too.
With Solus printer manager, it install printer too, it seems ok too.
So I have 5 versions now, with 4 who seems to be ok.
I don't know which is the better one...
I will try in use.
Thank you