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I am using XUbuntu 18.04 and I am struggling to install my scanner. I have tried everything i have been able to find on both Brother homepage and AskUbuntu.
I have newest brsaneconfig4, brscan-skey and rules.

Command brsaneconfig4 -q returns:

(...)

Devices on network

0 DCP-7055W           "DCP-7055W"         I:192.168.1.28

Command scanimage -L returns:

device `brother4:net1;dev0' is a Brother DCP-7055W DCP-7055W

While command brscan-skey -l returns:

DCP-7055W         : brother4:net1;dev0  : 192.168.1.28         Not responded

I have libsane-brother4.so installed in /usr/lib64/sane, /usr/lib/sane and /usr/lib/x86_64-linux-gnu/sane

Command dpkg -l | grep Brother returns:

ii  brother-udev-rule-type1               1.0.2                               all          Brother udev rule type 1

ii  brscan-skey                           0.2.4-1                             amd64        Brother Linux scanner S-KEY tool

ii  brscan4                               0.4.6-1                             amd64        Brother Scanner Driver

ii  dcp7055wcupswrapper:i386              3.0.1-1                             i386         Brother DCP-7055W CUPS wrapper driver

ii  dcp7055wlpr:i386                      3.0.1-1                             i386         Brother DCP-7055W LPR driver

ii  printer-driver-brlaser                4-1                                 amd64        printer driver for (some) Brother laser printers

ii  printer-driver-ptouch                 1.4.2-3                             amd64        printer driver Brother P-touch label printers

and my libsane file has following content:

#

#   udev rules 

#



ACTION!="add", GOTO="brother_mfp_end"

SUBSYSTEM=="usb", GOTO="brother_mfp_udev_1"

SUBSYSTEM!="usb_device", GOTO="brother_mfp_end"

LABEL="brother_mfp_udev_1"

SYSFS{idVendor}=="04f9", GOTO="brother_mfp_udev_2"

ATTRS{idVendor}=="04f9", GOTO="brother_mfp_udev_2"

GOTO="brother_mfp_end"

LABEL="brother_mfp_udev_2"

ATTRS{bInterfaceClass}!="0ff", GOTO="brother_mfp_end"

ATTRS{bInterfaceSubClass}!="0ff", GOTO="brother_mfp_end"

ATTRS{bInterfaceProtocol}!="0ff", GOTO="brother_mfp_end"

#MODE="0666"

#GROUP="scanner"

ENV{libsane_matched}="yes"

#SYMLINK+="scanner-%k"

LABEL="brother_mfp_end"

I have tried everything without any significant success. At some point I have had working scanner, but after reboot it was no longer visible in SimpleScan. How can i make this work? What is missing?

I came across the posting Brother MFC-L2700DW printer can print, can’t scan by oscar1919 on Ask Ubuntu. I have a Brother multi-function printer but a different model than that specified by Oscar.

Oscar indicated that some of the installation files may be copied into the wrong folder. For 64-bit Linux, the instructions were to check that the folder /usr/lib/x86_64-linux-gnu/sane exists.

However, In my case, this folder was indeed present, but it was empty. The subsequent instructions were, essentially to copy the files libsane-brother* from the /usr/lib64/sane/ folder to /usr/lib/x86_64-linux-gnu/sane.

On my system, the three files to be copied were: libsane-brother2.so, libsane-brother2.so.1 and libsane-brother2.so.1.0.7.

Once these files were located in the /usr/lib/x86_64-linux-gnu/sane folder, Simple Scan sprung to life and scanned a test document.