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CUPS

Cups webinterface

http://localhost:631/

By default it uses normal system users and their passwords (root for admin). By default CUPS @SYSTEM group is mapped to system lpadmin group, so user should be added into lpadmin group.

To create internal CUPS users: 

lppaswd -g lpadmin -a username

and file /etc/cups/passwd.md5 will be created/updated

For more permissions look into /etc/cups/cupsd.conf

cups-pdf

/etc/cups/cups-pdf.conf
LogType 7

Error: “failed to set file mode” Issue not related to apparmor (not enabled).

Solution: 

Error is generated by cups-pdf but is relative to ghostscript rights. Ghostscript seems to need full rights in its temp work dir.
Setting "GSTmp /tmp" instead of "GSTmp /var/tmp" in /etc/cups/cups-pdf.conf solves the problem for me.

Brother DCP-7055W

lpadmin -p DCP7055W -v lpd://192.168.179.1/binary_p1 -E -P /usr/share/cups/model/brother-DCP-7055W-cups-en.ppd

Samsung ML-1640

apt-get install printer-driver-splix

Connect USB printer, and XFCE Desktop will detect it and use driver automatically. OR: In printer settings, add new network printer. Choose Samsung and ML-1640 model. Device URI: 

socket://192.168.1.3:9100

HP LaserJet Pro MFP M127fw

sudo apt-get install hplip-gui

New GUI application HPLIP Toolbox will be installed.

  • Run app and add network printer using network discovery.
  • Let download plugin from Hp server

Network scanner

sudo apt-get install sane-utils
sudo apt-get install snmp-mibs-downloader
/etc/default/saned
RUN=yes
/etc/sane.d/saned.conf
192.168.0.0/22
service saned restart
Failed to restart saned.service: Unit saned.service is masked.

Which is correct when systemd is used. Saned service is activated by saned.socket on TCP:6566 

systemctl enable saned.socket

Enable proper backend in /etc/sane.d/dll.conf 

scanimage -L
scanimage > test.ppm

Problem is that remote saned clients has to known hpaio driver to use it. So it is not possible to use it on Android. 

Options specific to device `hpaio:/net/HP_LaserJet_Pro_MFP_M127fw?ip=192.168.1.107':
  Scan mode:
    --mode Lineart|Gray|Color [Lineart]
        Selects the scan mode (e.g., lineart, monochrome, or color).
    --resolution 75|100|150|200|300|600|1200dpi [75]
        Sets the resolution of the scanned image.
    --source Flatbed|ADF [Flatbed]
        Selects the scan source (such as a document-feeder).
  Advanced:
    --brightness -1000..1000 [0]
        Controls the brightness of the acquired image.
    --contrast -1000..1000 [0]
        Controls the contrast of the acquired image.
    --compression None|JPEG [JPEG]
        Selects the scanner compression method for faster scans, possibly at
        the expense of image quality.
    --jpeg-quality 0..100 [inactive]
        Sets the scanner JPEG compression factor. Larger numbers mean better
        compression, and smaller numbers mean better image quality.
  Geometry:
    -l 0..215.9mm [0]
        Top-left x position of scan area.
    -t 0..296.926mm [0]
        Top-left y position of scan area.
    -x 0..215.9mm [215.9]
        Width of scan-area.
    -y 0..296.926mm [296.926]
        Height of scan-area.

Issue: unable to load library libm.so

Not possible to scan. Every software which is using sane timeouts with: 

/hp-scan: common/utils.c 188: unable to load library libm.so: /usr/lib/x86_64-linux-gnu/libm.so: invalid ELF header
xsane: io/hpmud/jd.c 678: timeout read_channel sec=45 hp:/net/HP_LaserJet_Pro_MFP_M127fw?ip=192.168.1.107
xsane: http.c 189: timeout reading data sec_timeout=45
error: SANE: Error during device I/O (code=9)

Sane web frontends

http://www.sane-project.org/sane-frontends.html