• https://support.brother.com/g/b/downloadlist.aspx?c=de&lang=de&prod=mfcl3750cdw_us_eu_as&os=128&flang=English

To install LPR, CUPSwrapper driver and scanner driver (for scanner models), download the “Driver Install Tool” (linux-brprinter-installer-*.*.*-*.gz).

MYUSER="YOURUSERNAME"; MYGROUP="${MYUSER}"
mkdir -pv /home/$MYUSER/repos/extern/brother/
mv /home/$MYUSER/Downloads/linux-brprinter-installer-*.*.*-*.gz /home/$MYUSER/repos/extern/brother/
gunzip -v -k -c /home/$MYUSER/repos/extern/brother/linux-brprinter-installer-*.*.*-*.gz > /home/$MYUSER/repos/extern/brother/linux-brprinter-installer.sh
chown -R $MYUSER:$MYGROUP /home/$MYUSER/repos/extern/brother/
chmod u+x /home/$MYUSER/repos/extern/brother/linux-brprinter-installer.sh
/home/$MYUSER/repos/extern/brother/linux-brprinter-installer.sh MFC-L3750CDW

The driver installation will start. Follow the installation screen directions.

When you see the message “Will you specify the DeviceURI ?”,

• For USB Users: Choose N(No)
• For Network Users: Choose Y(Yes) and DeviceURI number.

The install process may take some time. Please wait until it is complete.

apt install xsane

~~DISCUSSION~~