I updated again the system and did one more reboot. Problem remained.
Then I installed xsane - and could not make it to scan multiple pages. Also tried paperwork buty, though I followed all procedures, failed to make my scanner recognized by it.
I also looked up in AskUbuntu. There are old posts about "Failed to save file // Failed to execute child process etc" but I could not find a satisfactory reply to these posts.
I enclose a screenshot of the error message I get when I try do save a scanned doc with more than one page into a file.
