I found HPLIP was already installed. I added HPIJS for good measure.
I was able to select a driver "HP Officejet Pro K550 hpijs, 3.15.2”.

The printer is still “not responding.”

I didn’t see HPLIP mentioned anywhere in the driver choices.
_________

Details follow. 

Selected the driver and asked for a test page:

  Description: HP Officejet Pro K550
  Device URI: dnssd://K550._pdl-datastream._tcp.local/ <dnssd://K550._pdl-datastream._tcp.local/>
  Make and Model: HP Officejet Pro K550 hpijs, 3.15.2
  Result: Processing - The printer is not responding.

Printer’s light is green, and it’s working from the Macbook.
I notice that the printer icon doesn’t show in the taskbar.

Tried printer-make “Generic (recommended)”:
   There are ESC/P, GDI, IBM-Compatible, OAKT,
   PCL*, PDF, PostScript*, Raw Queue, text-only and ZjStream.
   I chose PCL 3 (recommended).
   Two drivers are offered: Foomatic and K550 hpijs, 3.15.2 [en].
   I chose the hpijs.

Print Test Page —> Connecting to Printer —> not responding.
Same as before.
__________________

On Feb 20, 2016, at 10:59:13, Brian Cluff <brian@snaptek.com> wrote:

Do you have hplip installed?  That printer is reported to "Work Perfectly" on the list of supported printers.

http://www.openprinting.org/printer/HP/HP-OfficeJet_Pro_K550

It says:
"For basic printing functionality use the HPIJS driver . For advanced functionality such as printer status, maintenance features, scanning and photo card unload use the HPLIP driver (which includes HPIJS)."

Brian Cluff

On 02/20/2016 10:44 AM, Victor Odhner wrote:
> Keith wrote: "/HP is very good about providing drivers for their
> printers/.” Not necessarily so, after they weary of supporting it.
> 
> We have an HP OfficeJet K550, a nice printer that’s working well but
> maybe as much as 10 years old. My recently installed Mint system doesn’t
> show the K550; it comes up with a different printer’s name, labeled as
> “recommended,” and that driver doesn’t work: it finds the printer but
> when I try to print it declares that it is not connected.
> 
> My Macbook has no problem finding it and printing. My son’s Win10 uses
> the PCL3 Class Driver and works OK for plain text, but Win10 can’t find
> a K550 driver. He says that HP has removed drivers and other support for
> this printer, which is at “end of support”.
> 
> I did find this:
> http://hplipopensource.com/hplip-web/models/officejet/officejet_pro_k550.html
> … which claims to have have a K550 driver.
> 
> I haven’t tried to figure out how hplip works, since I can move
> documents to my DropBox and print from the Macbook.
> ___________
> 
> On Feb 20, 2016, at 09:12:48, Brian Cluff <brian@snaptek.com
> <mailto:brian@snaptek.com>> wrote:
> 
> On 02/20/2016 06:49 AM, Keith Smith wrote:
>> I have not researched how to configure the print to fax and how to scan
>> using Linux... not sure it will work in these capacities with Linux.
> 
> In my experience it is very likely that you WOULD be able to scan with
> an HP all-in-one.  HP is very good about providing drivers for their
> printers.
> 
> Brian Cluff
> 
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