2 Computers both Mint 18. HP Office Jet Pro all in one. Can print from both but can scan from only one. When I run xsane (or simple scan) from the second computer xsane reports"No Device Available"

Is there a scanner? Please post the output of and

Is the printer connected to network?

Defined printer URIs the same?(Both Linux hosts)
If using the HPLIP driver, the printer must be using the 'hp' backend in order for 'hpaio' (HPLIP scanner driver) to work.

There is a scanner. The 6970 is an all in one. The other computer is able to run the scanner.

sudo lsusb
[sudo] password for maryellen:
Bus 001 Device 003: ID 05ac:8300 Apple, Inc. Built-in iSight (no firmware loaded)
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 003: ID 05ac:8205 Apple, Inc. Bluetooth HCI
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 002: ID 05ac:8240 Apple, Inc. Built-in IR Receiver
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 05ac:021a Apple, Inc. Internal Keyboard/Trackpad (ANSI)
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

$ scanimage -L

No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).

The printer is connected to the network

lpstat -t
scheduler is running
system default destination: HP-OfficeJet-Pro-6970
device for HP-OfficeJet-Pro-6970: dnssd://HP%20OfficeJet%20Pro%206970%20%5BD79C4B%5D._ipp._tcp.local/?uuid=d7a2558b-5629-7026-ff06-efca17342cb6
device for HP-OfficeJet-Pro-6970@tom-Inspiron-1520120.local: ipps://tom-Inspiron-1520120.local:631/printers/HP-OfficeJet-Pro-6970
device for XP-400-Series: ipps://tom-Inspiron-1520120.local:631/printers/XP-400-Series
HP-OfficeJet-Pro-6970 accepting requests since Sun 22 Nov 2020 09:15:13 PM CST
HP-OfficeJet-Pro-6970@tom-Inspiron-1520120.local accepting requests since Mon 23 Nov 2020 07:35:11 AM CST
XP-400-Series accepting requests since Mon 23 Nov 2020 07:35:11 AM CST
printer HP-OfficeJet-Pro-6970 is idle. enabled since Sun 22 Nov 2020 09:15:13 PM CST
printer HP-OfficeJet-Pro-6970@tom-Inspiron-1520120.local is idle. enabled since Mon 23 Nov 2020 07:35:11 AM CST
printer XP-400-Series is idle. enabled since Mon 23 Nov 2020 07:35:11 AM CST

Closely related to your other thread. This has yet more little details that you didn't include initially....such as, this being connected to the NETWORK instead of via USB. You will have to scan using the HPLIP tool.

What is the HPLIP tool? Something I need to install? I am able to scan over the network from the first computer using xsane and simple scan. Don't remember how I went about adding the 6970 2 years ago. Anyway different drivers are required whether connected with USB or over the net? Seems like I had to connect the 6970 with USB when I first set it up,

Unless your printer is configured to use the 'hp' printer backend, then the hpaio scanner driver will not function. (It relies on the printer URI for communication.)
Please compare your working host with your not working host.

The other thing you should also check is the /etc/sane.d/dll.conf contains the uncommented 'hpaio' entry.

device for HP-OfficeJet-Pro-6970: dnssd://HP%20OfficeJet%20Pro%206970%20%5BD79C4B%5D._ipp._tcp.local/?uuid=d7a2558b-5629-7026-ff06-efca17342cb6
device: command not found

$ device for HP-OfficeJet-Pro-6970@tom-Inspiron-1520120.local: ipps://tom-Inspiron-1520120.local:631/printers/HP-OfficeJet-Pro-6970
device: command not found


Could not find "/etc/sane.d/dll.conf " on either

Please use CODE tags when posting output (refer to the # button in the advanced forum editor).

This wasn't a command for you to type!! That was me posting some of the output you shared, hence the error you got...

Report back with
Is the 'sane-backends' package installed? (The dll.conf file is included as part of that package.)

Working:
$ ls -l /etc/sane.d
total 328
-rw-r--r-- 1 root root 25 Sep 18 2015 abaton.conf
-rw-r--r-- 1 root root 14 Sep 18 2015 agfafocus.conf
-rw-r--r-- 1 root root 1957 Jan 28 2020 airscan.conf
-rw-r--r-- 1 root root 24 Sep 18 2015 apple.conf
-rw-r--r-- 1 root root 26 Sep 18 2015 artec.conf
-rw-r--r-- 1 root root 4140 Sep 18 2015 artec_eplus48u.conf
-rw-r--r-- 1 root root 548 Sep 18 2015 avision.conf
-rw-r--r-- 1 root root 29 Sep 18 2015 bh.conf
-rw-r--r-- 1 root root 193 Sep 18 2015 canon630u.conf
-rw-r--r-- 1 root root 26 Sep 18 2015 canon.conf
-rw-r--r-- 1 root root 3885 Sep 18 2015 canon_dr.conf
-rw-r--r-- 1 root root 1160 Sep 18 2015 canon_pp.conf
-rw-r--r-- 1 root root 509 Sep 18 2015 cardscan.conf
-rw-r--r-- 1 root root 754 Sep 18 2015 coolscan2.conf
-rw-r--r-- 1 root root 754 Sep 18 2015 coolscan3.conf
-rw-r--r-- 1 root root 34 Sep 18 2015 coolscan.conf
-rw-r--r-- 1 root root 984 Sep 18 2015 dc210.conf
-rw-r--r-- 1 root root 984 Sep 18 2015 dc240.conf
-rw-r--r-- 1 root root 704 Sep 18 2015 dc25.conf
-rw-r--r-- 1 root root 492 Sep 18 2015 dell1600n_net.conf
-rw-r--r-- 1 root root 1098 Sep 18 2015 dll.conf
drwxr-xr-x 2 root root 4096 Feb 5 2020 dll.d
-rw-r--r-- 1 root root 12 Sep 18 2015 dmc.conf
-rw-r--r-- 1 root root 2569 Sep 18 2015 epjitsu.conf
-rw-r--r-- 1 root root 376 Sep 18 2015 epson2.conf
-rw-r--r-- 1 root root 793 Sep 18 2015 epson.conf
-rw-r--r-- 1 root root 221 Sep 18 2015 epsonds.conf
-rw-r--r-- 1 root root 2248 Sep 18 2015 fujitsu.conf
-rw-r--r-- 1 root root 2008 Sep 18 2015 genesys.conf
-rw-r--r-- 1 root root 1149 Sep 18 2015 gphoto2.conf
-rw-r--r-- 1 root root 7795 Sep 18 2015 gt68xx.conf
-rw-r--r-- 1 root root 396 Sep 18 2015 hp3900.conf
-rw-r--r-- 1 root root 76 Sep 18 2015 hp4200.conf
-rw-r--r-- 1 root root 238 Sep 18 2015 hp5400.conf
-rw-r--r-- 1 root root 497 Sep 18 2015 hp.conf
-rw-r--r-- 1 root root 22 Sep 18 2015 hpsj5s.conf
-rw-r--r-- 1 root root 24 Sep 18 2015 hs2p.conf
-rw-r--r-- 1 root root 38 Sep 18 2015 ibm.conf
-rw-r--r-- 1 root root 2599 Sep 18 2015 kodakaio.conf
-rw-r--r-- 1 root root 367 Sep 18 2015 kodak.conf
-rw-r--r-- 1 root root 113 Sep 18 2015 leo.conf
-rw-r--r-- 1 root root 119 Sep 18 2015 lexmark.conf
-rw-r--r-- 1 root root 187 Sep 18 2015 ma1509.conf
-rw-r--r-- 1 root root 1254 Sep 18 2015 magicolor.conf
-rw-r--r-- 1 root root 666 Sep 18 2015 matsushita.conf
-rw-r--r-- 1 root root 279 Sep 18 2015 microtek2.conf
-rw-r--r-- 1 root root 268 Sep 18 2015 microtek.conf
-rw-r--r-- 1 root root 2125 Sep 18 2015 mustek.conf
-rw-r--r-- 1 root root 3824 Sep 18 2015 mustek_pp.conf
-rw-r--r-- 1 root root 809 Sep 18 2015 mustek_usb.conf
-rw-r--r-- 1 root root 13 Sep 18 2015 nec.conf
-rw-r--r-- 1 root root 573 Sep 18 2015 net.conf
-rw-r--r-- 1 root root 365 Sep 18 2015 p5.conf
-rw-r--r-- 1 root root 75 Sep 18 2015 pie.conf
-rw-r--r-- 1 root root 492 Sep 18 2015 pixma.conf
-rw-r--r-- 1 root root 4142 Sep 18 2015 plustek.conf
-rw-r--r-- 1 root root 943 Sep 18 2015 plustek_pp.conf
-rw-r--r-- 1 root root 391 Sep 18 2015 qcam.conf
-rw-r--r-- 1 root root 29 Sep 18 2015 ricoh.conf
-rw-r--r-- 1 root root 183 Sep 18 2015 rts8891.conf
-rw-r--r-- 1 root root 13 Sep 18 2015 s9036.conf
-rw-r--r-- 1 root root 1052 Sep 18 2015 saned.conf
-rw-r--r-- 1 root root 48 Sep 18 2015 sceptre.conf
-rw-r--r-- 1 root root 1464 Sep 18 2015 sharp.conf
-rw-r--r-- 1 root root 115 Sep 18 2015 sm3840.conf
-rw-r--r-- 1 root root 2239 Sep 18 2015 snapscan.conf
-rw-r--r-- 1 root root 10 Sep 18 2015 sp15c.conf
-rw-r--r-- 1 root root 2224 Sep 18 2015 st400.conf
-rw-r--r-- 1 root root 178 Sep 18 2015 stv680.conf
-rw-r--r-- 1 root root 28 Sep 18 2015 tamarack.conf
-rw-r--r-- 1 root root 355 Sep 18 2015 teco1.conf
-rw-r--r-- 1 root root 636 Sep 18 2015 teco2.conf
-rw-r--r-- 1 root root 217 Sep 18 2015 teco3.conf
-rw-r--r-- 1 root root 1807 Sep 18 2015 test.conf
-rw-r--r-- 1 root root 1495 Sep 18 2015 u12.conf
-rw-r--r-- 1 root root 386 Sep 18 2015 umax1220u.conf
-rw-r--r-- 1 root root 3094 Sep 18 2015 umax.conf
-rw-r--r-- 1 root root 1684 Sep 18 2015 umax_pp.conf
-rw-r--r-- 1 root root 3424 Sep 18 2015 xerox_mfp.conf





Non Working:
$ ls -l /etc/sane.d
total 324
-rw-r--r-- 1 root root 25 Sep 18 2015 abaton.conf
-rw-r--r-- 1 root root 14 Sep 18 2015 agfafocus.conf
-rw-r--r-- 1 root root 24 Sep 18 2015 apple.conf
-rw-r--r-- 1 root root 26 Sep 18 2015 artec.conf
-rw-r--r-- 1 root root 4140 Sep 18 2015 artec_eplus48u.conf
-rw-r--r-- 1 root root 548 Sep 18 2015 avision.conf
-rw-r--r-- 1 root root 29 Sep 18 2015 bh.conf
-rw-r--r-- 1 root root 193 Sep 18 2015 canon630u.conf
-rw-r--r-- 1 root root 26 Sep 18 2015 canon.conf
-rw-r--r-- 1 root root 3885 Sep 18 2015 canon_dr.conf
-rw-r--r-- 1 root root 1160 Sep 18 2015 canon_pp.conf
-rw-r--r-- 1 root root 509 Sep 18 2015 cardscan.conf
-rw-r--r-- 1 root root 754 Sep 18 2015 coolscan2.conf
-rw-r--r-- 1 root root 754 Sep 18 2015 coolscan3.conf
-rw-r--r-- 1 root root 34 Sep 18 2015 coolscan.conf
-rw-r--r-- 1 root root 984 Sep 18 2015 dc210.conf
-rw-r--r-- 1 root root 984 Sep 18 2015 dc240.conf
-rw-r--r-- 1 root root 704 Sep 18 2015 dc25.conf
-rw-r--r-- 1 root root 492 Sep 18 2015 dell1600n_net.conf
-rw-r--r-- 1 root root 1098 Sep 18 2015 dll.conf
drwxr-xr-x 2 root root 4096 Jun 28 2016 dll.d
-rw-r--r-- 1 root root 12 Sep 18 2015 dmc.conf
-rw-r--r-- 1 root root 2569 Sep 18 2015 epjitsu.conf
-rw-r--r-- 1 root root 376 Sep 18 2015 epson2.conf
-rw-r--r-- 1 root root 793 Sep 18 2015 epson.conf
-rw-r--r-- 1 root root 221 Sep 18 2015 epsonds.conf
-rw-r--r-- 1 root root 2248 Sep 18 2015 fujitsu.conf
-rw-r--r-- 1 root root 2008 Sep 18 2015 genesys.conf
-rw-r--r-- 1 root root 1149 Sep 18 2015 gphoto2.conf
-rw-r--r-- 1 root root 7795 Sep 18 2015 gt68xx.conf
-rw-r--r-- 1 root root 396 Sep 18 2015 hp3900.conf
-rw-r--r-- 1 root root 76 Sep 18 2015 hp4200.conf
-rw-r--r-- 1 root root 238 Sep 18 2015 hp5400.conf
-rw-r--r-- 1 root root 497 Sep 18 2015 hp.conf
-rw-r--r-- 1 root root 22 Sep 18 2015 hpsj5s.conf
-rw-r--r-- 1 root root 24 Sep 18 2015 hs2p.conf
-rw-r--r-- 1 root root 38 Sep 18 2015 ibm.conf
-rw-r--r-- 1 root root 2599 Sep 18 2015 kodakaio.conf
-rw-r--r-- 1 root root 367 Sep 18 2015 kodak.conf
-rw-r--r-- 1 root root 113 Sep 18 2015 leo.conf
-rw-r--r-- 1 root root 119 Sep 18 2015 lexmark.conf
-rw-r--r-- 1 root root 187 Sep 18 2015 ma1509.conf
-rw-r--r-- 1 root root 1254 Sep 18 2015 magicolor.conf
-rw-r--r-- 1 root root 666 Sep 18 2015 matsushita.conf
-rw-r--r-- 1 root root 279 Sep 18 2015 microtek2.conf
-rw-r--r-- 1 root root 268 Sep 18 2015 microtek.conf
-rw-r--r-- 1 root root 2125 Sep 18 2015 mustek.conf
-rw-r--r-- 1 root root 3824 Sep 18 2015 mustek_pp.conf
-rw-r--r-- 1 root root 809 Sep 18 2015 mustek_usb.conf
-rw-r--r-- 1 root root 13 Sep 18 2015 nec.conf
-rw-r--r-- 1 root root 573 Sep 18 2015 net.conf
-rw-r--r-- 1 root root 365 Sep 18 2015 p5.conf
-rw-r--r-- 1 root root 75 Sep 18 2015 pie.conf
-rw-r--r-- 1 root root 492 Sep 18 2015 pixma.conf
-rw-r--r-- 1 root root 4142 Sep 18 2015 plustek.conf
-rw-r--r-- 1 root root 943 Sep 18 2015 plustek_pp.conf
-rw-r--r-- 1 root root 391 Sep 18 2015 qcam.conf
-rw-r--r-- 1 root root 29 Sep 18 2015 ricoh.conf
-rw-r--r-- 1 root root 183 Sep 18 2015 rts8891.conf
-rw-r--r-- 1 root root 13 Sep 18 2015 s9036.conf
-rw-r--r-- 1 root root 1052 Sep 18 2015 saned.conf
-rw-r--r-- 1 root root 48 Sep 18 2015 sceptre.conf
-rw-r--r-- 1 root root 1464 Sep 18 2015 sharp.conf
-rw-r--r-- 1 root root 115 Sep 18 2015 sm3840.conf
-rw-r--r-- 1 root root 2239 Sep 18 2015 snapscan.conf
-rw-r--r-- 1 root root 10 Sep 18 2015 sp15c.conf
-rw-r--r-- 1 root root 2224 Sep 18 2015 st400.conf
-rw-r--r-- 1 root root 178 Sep 18 2015 stv680.conf
-rw-r--r-- 1 root root 28 Sep 18 2015 tamarack.conf
-rw-r--r-- 1 root root 355 Sep 18 2015 teco1.conf
-rw-r--r-- 1 root root 636 Sep 18 2015 teco2.conf
-rw-r--r-- 1 root root 217 Sep 18 2015 teco3.conf
-rw-r--r-- 1 root root 1807 Sep 18 2015 test.conf
-rw-r--r-- 1 root root 1495 Sep 18 2015 u12.conf
-rw-r--r-- 1 root root 386 Sep 18 2015 umax1220u.conf
-rw-r--r-- 1 root root 3094 Sep 18 2015 umax.conf
-rw-r--r-- 1 root root 1684 Sep 18 2015 umax_pp.conf
-rw-r--r-- 1 root root 3424 Sep 18 2015 xerox_mfp.conf

Both installs have dll.conf!

Use CODE tags as already requested!

For example?

code:
ls -l /etc/sane.d
total 324
-rw-r--r-- 1 root root 25 Sep 18 2015 abaton.conf
-rw-r--r-- 1 root root 14 Sep 18 2015 agfafocus.conf
-rw-r--r-- 1 root root 24 Sep 18 2015 apple.conf
-rw-r--r-- 1 root root 26 Sep 18 2015 artec.conf
-rw-r--r-- 1 root root 4140 Sep 18 2015 artec_eplus48u.conf
-rw-r--r-- 1 root root 548 Sep 18 2015 avision.conf
-rw-r--r-- 1 root root 29 Sep 18 2015 bh.conf
-rw-r--r-- 1 root root 193 Sep 18 2015 canon630u.conf
-rw-r--r-- 1 root root 26 Sep 18 2015 canon.conf
-rw-r--r-- 1 root root 3885 Sep 18 2015 canon_dr.conf
-rw-r--r-- 1 root root 1160 Sep 18 2015 canon_pp.conf
-rw-r--r-- 1 root root 509 Sep 18 2015 cardscan.conf
-rw-r--r-- 1 root root 754 Sep 18 2015 coolscan2.conf
-rw-r--r-- 1 root root 754 Sep 18 2015 coo ...

Don't know how to do.

No:
the word "code" enclosed in [ ] on the line before the text being enclosed and
the word "/code" enclosed in [ ] on the line after the text being enclosed
if you do it manually, or
In the advanced editor the # on the upper bar gives you the code tags for the selected text.

it changes from plain, unformatted text like this:

Running transaction
Preparing : 1/1
Installing : python3-dnf-plugin-versionlock-4.0.18-1.fc32.noarch 1/1
Running scriptlet: python3-dnf-plugin-versionlock-4.0.18-1.fc32.noarch 1/1
Verifying : python3-dnf-plugin-versionlock-4.0.18-1.fc32.noarch 1/1


to this
and makes things pasted from your screen much more readable