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Thanks! Saved me some frustration hours!

Finally it works!
After hour of search and tests...

From a CLEAN install...

0. I did't put the scanner IP in /etc/sane.d/xerox_mfp.conf

1. I installed the scan driver from the HP website
uld_V1.00.39_01.17.tar.gz > install-scanner.sh

2. The libs installed by the step 1. are in the wrong place, to work do:
sudo ln -s /opt/smfp-common/scanner/lib/libsane-smfp.so.1.0.1 /usr/lib/x86_64-linux-gnu/sane/libsane-smfp.so.1.0.1
sudo ln -s /usr/lib/x86_64-linux-gnu/sane/libsane-smfp.so.1.0.1 /usr/lib/x86_64-linux-gnu/sane/libsane-smfp.so.1
sudo ln -s /usr/lib/x86_64-linux-gnu/sane/libsane-smfp.so.1 /usr/lib/x86_64-linux-gnu/sane/libsane-smfp.so

3. And then intall the libusb package (libusb?? WTF!?)
sudo apt install libusb-0.1-4

4. Check if the scanner has been recognized
scanimage -L
device `smfp:net;10.9.9.20' is a Samsung SCX-3400 Series on 10.9.9.20 Scanner

5. Make a scan
scanimage -d 'smfp:net;10.9.9.20' --format=jpeg >out.jpeg
*It took 10 seconds to complete... Nice!

Simple Scan algo worked.

Hi, I got a problem with SCX-3405FW, it's too slow to scan over network.

Follow some info:
Printer: SCX-3405FW
Distro: Ubuntu 18.04
Conection: Network
Dirve: Without and with the driver (uld_V1.00.39_01.17.tar.gz) from HP site the scan is slow
Problem: Too slow to scan.

# First try:
sudo apt install xsane

sudo vim /etc/sane.d/xerox_mfp.conf
tcp 10.9.9.20 < put this

# Second Try
Download install the drive from HP


In the 2 cases above I got the same result...
The scan took 2 minutes to scan one page!
*the light took 20 seconds to scan the image

Does anyone know how to speed up the scan?