Install HP Color LaserJet Managed MFP E57540 on Ubuntu

Hopefully, your Ubuntu is version 18.04 or greater. If so, give the
outputs of

  avahi-browse -rt _ipp._tcp

and

  avahi-browse -rt _uscan._tcp

Here you go:

root@pc-gabriel-2:~# avahi-browse -rt _ipp._tcp
+ enp4s0f1 IPv4 HP Color LaserJet MFP E57540 [EEDB1D] Internet Printer local
= enp4s0f1 IPv4 HP Color LaserJet MFP E57540 [EEDB1D] Internet Printer local
   hostname = [NPIEEDB1D.local]
   address = [10.3.121.203]
   port = [631]
   txt = ["print_wfds=T" "mopria-certified=2.0" "PaperMax=legal-A4" "kind=document,envelope,photo" "mac=00:68:EB:EE:DB:1D" "Scan=T" "Fax=F" "Color=T" "Duplex=T" "TLS=1.2" "priority=30" "usb_MDL=HP Color LaserJet MFP E57540" "usb_MFG=Hewlett-Packard" "product=(HP Color LaserJet MFP E57540)" "URF=V1.4,CP99,RS300-600-1200,MT1-2-3-5-12,W8,PQ4,SRGB24,IS20-21,IFU21,DM1,OB10" "rp=ipp/print" "pdl=application/postscript,application/vnd.hp-PCL,application/pdf,image/urf,image/jpeg,application/vnd.hp-PCLXL,application/PCLm" "qtotal=1" "ty=HP Color LaserJet MFP E57540" "note=" "UUID=a77cdd24-3363-11ea-b75e-2c44fd20a192" "adminurl=http://NPIEEDB1D.local/airprint_mob_status.htm" "txtvers=1"]

root@pc-gabriel-2:~# avahi-browse -rt _uscan._tcp
root@pc-gabriel-2:~#

Just to add even more info: I installed the printer using CUPS (no HPLIP). Not sure if the problem needs to be closed, anyways on my side I can perform tasks for debugging if needed.

Gabriele, you have appeared to have taken the route I would have taken.
If you are printing, you can mark the issue as solved. HPLIP does not
seem to support your device anyway.

You are now using the modern, driverless printing technique. Unfortunately,
driverless scanning in ESCL mode is not possible because the second output
is empty. If the E57540 has an WSD mode it becomes a possibility.

> If the E57540 has an WSD mode it becomes a possibility.

I have become unsure about this statement. The Managed devices have
a focus on security and I think they do not allow scanning from a computer.
Not having any _uscan._tcp output in spite of the URF key being at version
1.4 is also another indication.

When you said

> Not sure if the problem needs to be closed ...

I suggested it should be. Perhaps I wasn't clear that this has to done from your end.

As I said,I don't have any particular interest in following up, but would be available for debugging if need be.

Your offer to debug is welcome, Gabriel., but not necessary.

Your device is not listed at

  https://developers.hp.com/hp-linux-imaging-and-printing/supported_devices/index

We probably will never know why not.

Meanwhile, you have a perfectly good method for printing. Forget about HPLIP,