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Running elementary OS freya 0.3.1 Freya with network printer HP Photosmart 7520 All-In-One Inkjet Printer/Copier/Scanner/Fax.

Printer works fine.

When I invoke Simple Scan to scan a document, the following error is displayed:

No scanners detected

Please check your scanner is connected and powered on

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  • Have you installed any additional drivers for it? – r3bl Oct 9 '15 at 12:56
  • @r3bl It's shouldn't be necessary. According to the HPLIP-Database HP Photosmart 7520 should be fully supported since version 3.12.9. elementary OS provides version 3.14.3 – Rafael Oct 10 '15 at 8:17
  • Please check if libsane-hpaio is installed. You can do it with running the following command in your terminal: dpkg -l | grep libsane-hpaio. If it's not installed, install it with sudo apt-get install libsane-hpaio. – Rafael Oct 10 '15 at 8:26
  • @Rafael Output of dpkg -l command indicates libsane-hpaio is installed. – Donald Oct 20 '15 at 2:51
  • I have the same problem with HP ENVY 4502 this very same printer scans and prints fine with other distros (ubuntu,linux lite,mint) on a network connection,only elementary fails to recognize scannner. This is what I get on terminal when I tried to reinstall hplip: Reading package lists... Done Building dependency tree Reading state information... Done libsane-hpaio is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. – Ari Torres Mar 5 '16 at 11:29
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If I do a direct connection to my HP Officejet Pro L7590 via USB, the printer is immediately recognized as a scanner as well. So, contrary to HP's own documentation, this seems to be a limitation of libsane-hpaio when trying to use over a wired network. This is the only way I have managed to get this to work.

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Remove printer from system settings.

Run

hp-setup -u
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  • You haven't explained what the command does or what the flag does. – RolandiXor Dec 9 '15 at 13:16
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I had a similar problem with my hp deskjet 2540 which I solved the following way:

  1. Make sure you have the hplip installed
  2. open system-config-printer from the command line
  3. Add the printer again (I called it "Scanner") and make sure you use the HP JetDirect Connection not IPP

Afterwards, I was able to scan even over wifi. Same trick worked on a Mint machine as well.

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