thank you Ed,

$ sane-find-scanner I get :
found USB scanner (vendor=0x03f0 [HP], product=0xac11 [Deskjet 2510 series]) at libusb:003:006

yes, on my computer it is installed hplip - and I  also tried to run hp-plugin..
I don't remember if I needed hp-setup for the first installation.

I also tried to reinstall xsane but this wasn't enough (the file of setup remained) .

xsane worked good for much time as till I made samting wrong ... (in the setup panel (?))

I rewrite the content of journalctl...

Aug 25 11:18:04 localhost.pluto xsane[2791]: scan/sane/http.c 300: unable to open HP-LEDM-SCAN channel
Aug 25 11:18:04 localhost.pluto xsane[2791]: scan/sane/bb_ledm.c 531: unable to open http connection hp:/usb/Deskjet_2510_series?serial=CN34B3JGDN05TX

On Sat, Aug 25, 2018 at 3:30 PM Ed Greshko <ed.greshko@greshko.com> wrote:
On 08/25/18 17:51, Angelo Moreschini wrote:
> recently xsane stopped to work on my computer...
>
> I don't remember exactly what i did when this happened (perhaps I made something of
> wrong on the panel configuration setting ??).
>
> They are several days that I manage to fix this problem.Actually I get the error :
> "xsane error during device I/O failed to open device hpaio:/usb/Deskjet..."


You don't mention what model of HP printer/scanner you have?  DeskJet 2510? 
And did you previously install it using the hp-setup utility?

I have had several HP printer/scanners.  Currently have an OfficeJet Pro 8710.  I
think my previous one was a 6500.  I had both of them set as wireless and not USB and
haven't had a problem with either printing or scanning.

If you did use the hp-setup utility, maybe you should consider deleting the devices
and doing the setup again?

If you think you may have set something in error on the printer maybe you can reset
to defaults?

--
Conjecture is just a conclusion based on incomplete information. It isn't a fact.

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