I am on Ubuntu 18.10 and Mint 19.1 and can confirm this problem! I bought a HP LaserJet Pro MFP M28w yesterday. On Ubuntu 18.10 and Mint 19.1 with HPLIP 3.19.1 when I used hp-scan without any parameters it took 1:08 minutes to start the scan. The whole process took about 1:51 minutes. When I called xsane it took 20 secs to finish scanning for devices and open the main windows, 1:20 to acquire the colored preview, and it took 1:21 to scan the image at 300 dpi and show it in the Viewer. I will keep using my F4480 to scan things on Linux until that problem is fixed. Video here: https://youtu.be/7KjkDA3I0M8 Ubuntu 18.10 HPLIP 3.19.1 hp-scan output: lodoss@lodoss:~$ hp-scan HP Linux Imaging and Printing System (ver. 3.19.1) Scan Utility ver. 2.2 Copyright (c) 2001-15 HP Development Company, LP This software comes with ABSOLUTELY NO WARRANTY. This is free software, and you are welcome to distribute it under certain conditions. See COPYING file for more details. warning: No destinations specified. Adding 'file' destination by default. Using device hpaio:/usb/HP_LaserJet_MFP_M28-M31?serial=VNB3B09764 Opening connection to device... Resolution: 300dpi Mode: gray Compression: JPEG Scan area (mm): Top left (x,y): (0.000000mm, 0.000000mm) Bottom right (x,y): (215.900009mm, 297.010681mm) Width: 215.900009mm Height: 297.010681mm Destination(s): file Output file: warning: File destination enabled with no output file specified. Setting output format to PNG for greyscale mode. warning: Defaulting to '/home/lodoss/hpscan007.png'. Warming up... Scanning... Reading data: [*******************************************************************************] 100% 8.5 MB Read 8.5 MB from scanner. Closing device. Outputting to destination 'file': Done. Hp-check results on Ubuntu 18.10: lodoss@lodoss:~$ hp-check Saving output in log file: /home/lodoss/hp-check.log HP Linux Imaging and Printing System (ver. 3.19.1) Dependency/Version Check Utility ver. 15.1 Copyright (c) 2001-15 HP Development Company, LP This software comes with ABSOLUTELY NO WARRANTY. This is free software, and you are welcome to distribute it under certain conditions. See COPYING file for more details. Note: hp-check can be run in three modes: 1. Compile-time check mode (-c or --compile): Use this mode before compiling the HPLIP supplied tarball (.tar.gz or .run) to determine if the proper dependencies are installed to successfully compile HPLIP. 2. Run-time check mode (-r or --run): Use this mode to determine if a distro supplied package (.deb, .rpm, etc) or an already built HPLIP supplied tarball has the proper dependencies installed to successfully run. 3. Both compile- and run-time check mode (-b or --both) (Default): This mode will check both of the above cases (both compile- and run-time dependencies). Check types: a. EXTERNALDEP - External Dependencies b. GENERALDEP - General Dependencies (required both at compile and run time) c. COMPILEDEP - Compile time Dependencies d. [All are run-time checks] PYEXT SCANCONF QUEUES PERMISSION Status Types: OK MISSING - Missing Dependency or Permission or Plug-in INCOMPAT - Incompatible dependency-version or Plugin-version --------------- | SYSTEM INFO | --------------- Kernel: 4.18.0-11-generic #12-Ubuntu SMP Tue Oct 23 19:22:37 UTC 2018 GNU/Linux Host: lodoss Proc: 4.18.0-11-generic #12-Ubuntu SMP Tue Oct 23 19:22:37 UTC 2018 GNU/Linux Distribution: 12 18.10 Bitness: 64 bit ----------------------- | HPLIP CONFIGURATION | ----------------------- HPLIP-Version: HPLIP 3.19.1 HPLIP-Home: /usr/share/hplip HPLIP-Installation: Auto installation is supported for ubuntu distro 18.10 version Current contents of '/etc/hp/hplip.conf' file: # hplip.conf. Generated from hplip.conf.in by configure. [hplip] version=3.19.1 [dirs] home=/usr/share/hplip run=/var/run ppd=/usr/share/ppd/HP ppdbase=/usr/share/ppd doc=/usr/share/doc/hplip-3.19.1 html=/usr/share/doc/hplip-3.19.1 icon=/usr/share/applications cupsbackend=/usr/lib/cups/backend cupsfilter=/usr/lib/cups/filter drv=/usr/share/cups/drv/hp bin=/usr/bin apparmor=/etc/apparmor.d # Following values are determined at configure time and cannot be changed. [configure] network-build=yes libusb01-build=no pp-build=no gui-build=yes scanner-build=yes fax-build=yes dbus-build=yes cups11-build=no doc-build=yes shadow-build=no hpijs-install=no foomatic-drv-install=no foomatic-ppd-install=no foomatic-rip-hplip-install=no hpcups-install=yes cups-drv-install=yes cups-ppd-install=no internal-tag=3.19.1 restricted-build=no ui-toolkit=qt4 qt3=no qt4=yes qt5=no policy-kit=no lite-build=no udev_sysfs_rules=no hpcups-only-build=no hpijs-only-build=no apparmor_build=yes class-driver=no Current contents of '/var/lib/hp/hplip.state' file: [plugin] installed = 1 eula = 1 version = 3.19.1 Current contents of '~/.hplip/hplip.conf' file: [upgrade] notify_upgrade = true last_upgraded_time = 1551631346 pending_upgrade_time = 0 [last_used] device_uri = hpaio:/usb/HP_LaserJet_MFP_M28-M31?serial=VNB3B09764 [installation] date_time = 03/03/2019 14:22:45 version = 3.19.1 -------------- | COMPILEDEP | -------------- gcc gcc - GNU Project C and C++ Compiler REQUIRED - 8.2.0 OK - make make - GNU make utility to maintain groups of programs REQUIRED 3.0 4.2.1 OK - libtool libtool - Library building support services REQUIRED - 2.4.6 OK - ------------------------ | General Dependencies | ------------------------ libcrypto libcrypto - OpenSSL cryptographic library REQUIRED - 1.1.1 OK - python-xml Python XML libraries REQUIRED - 2.2.6 OK - libnetsnmp-devel libnetsnmp-devel - SNMP networking library development files REQUIRED 5.0.9 5.7.3 OK - sane-devel SANE - Scanning library development files REQUIRED - - OK - pil PIL - Python Imaging Library (required for commandline scanning with hp-scan) OPTIONAL - 1.1.7 OK - pyqt4-dbus PyQt 4 DBus - DBus Support for PyQt4 REQUIRED 4.0 4.12.1 OK - libpthread libpthread - POSIX threads library REQUIRED - 2.28 OK - python-devel Python devel - Python development files REQUIRED 2.2 2.7.15 OK - cups-devel CUPS devel- Common Unix Printing System development files REQUIRED - 2.2.8 OK - python-dbus Python DBus - Python bindings for DBus REQUIRED 0.80.0 1.2.8 OK - cups-ddk CUPS DDK - CUPS driver development kit OPTIONAL - - OK - reportlab Reportlab - PDF library for Python OPTIONAL 2.0 3.5.6 OK - pyqt4 PyQt 4- Qt interface for Python (for Qt version 4.x) REQUIRED 4.0 4.12.1 OK - libusb libusb - USB library REQUIRED - 1.0 OK - cups-image CUPS image - CUPS image development files REQUIRED - 2.2.8 OK - python2X Python 2.2 or greater - Python programming language REQUIRED 2.2 2.7.15 OK - python-notify Python libnotify - Python bindings for the libnotify Desktop notifications OPTIONAL - - OK - libjpeg libjpeg - JPEG library REQUIRED - - OK - sane SANE - Scanning library REQUIRED - - OK - ---------------------- | Scan Configuration | ---------------------- scanext Scan-SANE-Extension REQUIRED - 3.19.1 OK - hpaio HPLIP-SANE-Backend REQUIRED - 3.19.1 OK 'hpaio found in /etc/sane.d/dll.conf' ------------------------- | External Dependencies | ------------------------- gs GhostScript - PostScript and PDF language interpreter and previewer REQUIRED 7.05 9.26 OK - scanimage scanimage - Shell scanning program OPTIONAL 1.0 1.0.27 OK - cups CUPS - Common Unix Printing System REQUIRED 1.1 2.2.8 OK 'CUPS Scheduler is running' network network -wget OPTIONAL - 1.19.5 OK - policykit PolicyKit - Administrative policy framework OPTIONAL - 0.105 OK - xsane xsane - Graphical scanner frontend for SANE OPTIONAL 0.9 0.999 OK - dbus DBus - Message bus system REQUIRED - 1.12.10 OK - avahi-utils avahi-utils OPTIONAL - 0.7 OK - --------------------- | Python Extentions | --------------------- hpmudext IO-Extension REQUIRED - 3.19.1 OK - cupsext CUPS-Extension REQUIRED - 3.19.1 OK - ------------------------------ | DISCOVERED SCANNER DEVICES | ------------------------------ device `hpaio:/usb/HP_LaserJet_MFP_M28-M31?serial=VNB3B09764' is a Hewlett-Packard HP_LaserJet_MFP_M28-M31 all-in-one device `hpaio:/usb/HP_LaserJet_MFP_M28-M31?serial=VNB3B09764' is a Hewlett-Packard HP_LaserJet_MFP_M28-M31 all-in-one -------------------------- | DISCOVERED USB DEVICES | -------------------------- Device URI Model ------------------------------------------------- ------------------------------------- hp:/usb/HP_LaserJet_MFP_M28-M31?serial=VNB3B09764 HP LaserJet MFP M28-M31 --------------------------------- | INSTALLED CUPS PRINTER QUEUES | --------------------------------- Deskjet-F4400-series -------------------- Type: Printer Device URI: hp:/usb/Deskjet_F4400_series?serial=CN97SBR13105C5 PPD: /etc/cups/ppd/Deskjet-F4400-series.ppd warning: Failed to read /etc/cups/ppd/Deskjet-F4400-series.ppd ppd file PPD Description: Printer status: printer Deskjet-F4400-series is idle. enabled since seg 19 nov 2018 11:51:55 -02 error: Unable to communicate with device (code=12): hp:/usb/Deskjet_F4400_series?serial=CN97SBR13105C5 error: Device not found error: Communication status: Failed HP-LaserJet-MFP-M28-M31 ----------------------- Type: Printer Device URI: hp:/usb/HP_LaserJet_MFP_M28-M31?serial=VNB3B09764 PPD: /etc/cups/ppd/HP-LaserJet-MFP-M28-M31.ppd warning: Failed to read /etc/cups/ppd/HP-LaserJet-MFP-M28-M31.ppd ppd file PPD Description: Printer status: printer HP-LaserJet-MFP-M28-M31 is idle. enabled since dom 03 mar 2019 14:20:53 -03 Communication status: Good HP_LaserJet_MFP_M28-M31 ----------------------- Type: Printer Device URI: hp:/usb/HP_LaserJet_MFP_M28-M31?serial=VNB3B09764 PPD: /etc/cups/ppd/HP_LaserJet_MFP_M28-M31.ppd warning: Failed to read /etc/cups/ppd/HP_LaserJet_MFP_M28-M31.ppd ppd file PPD Description: Printer status: printer HP_LaserJet_MFP_M28-M31 is idle. enabled since dom 03 mar 2019 00:56:21 -03 Communication status: Good -------------- | PERMISSION | -------------- USB HP-LaserJet-MFP-M28-M31 Required - - OK Node:'/dev/bus/usb/003/007' Perm:' root lp rw- rw- rw- rw- r--' ----------- | SUMMARY | ----------- Missing Required Dependencies ----------------------------- None Missing Optional Dependencies ----------------------------- None Total Errors: 1 Total Warnings: 0 Done. lodoss@lodoss:~$