打印机：HP LaserJet Pro MFP M125ra
操作系统：Ubuntu 18.04.2 LTS
问题：MFU 的工作方式与打印机类似，但不能与扫描仪类似。
从 developers.hp.com 安装最新的 HPLIP 版本：3.19.5。
$ hp-setup -i
HP Linux Imaging and Printing System (ver. 3.19.5)
Printer/Fax Setup Utility ver. 9.0
Copyright (c) 2001-18 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: Defaults for each question are maked with a '*'. Press <enter> to accept the default.)
--------------------------------
| SELECT CONNECTION (I/O) TYPE |
--------------------------------
Num Connection Description
Type
-------- ---------- ----------------------------------------------------------
0* usb Universal Serial Bus (USB)
1 net Network/Ethernet/Wireless (direct connection or JetDirect)
Enter number 0...1 for connection type (q=quit, enter=usb*) ?
Using connection type: usb
error: No device selected/specified or that supports this functionality.
XSane 显示错误：
$ sane-find-scanner
# sane-find-scanner will now attempt to detect your scanner. If the
# result is different from what you expected, first make sure your
# scanner is powered up and properly connected to your computer.
# No SCSI scanners found. If you expected something different, make sure that
# you have loaded a kernel SCSI driver for your SCSI adapter.
found USB scanner (vendor=0x03f0 [Hewlett-Packard], product=0x222a [HP LaserJet Pro MFP M125ra]) at libusb:002:007
could not open USB device 0x045e/0x0800 at 002:006: Access denied (insufficient permissions)
could not open USB device 0x04d9/0x0175 at 002:005: Access denied (insufficient permissions)
could not open USB device 0x2109/0x2812 at 002:003: Access denied (insufficient permissions)
could not open USB device 0x8087/0x0024 at 002:002: Access denied (insufficient permissions)
could not open USB device 0x1d6b/0x0002 at 002:001: Access denied (insufficient permissions)
could not open USB device 0x1d6b/0x0003 at 004:001: Access denied (insufficient permissions)
could not open USB device 0x046d/0xc52b at 003:003: Access denied (insufficient permissions)
could not open USB device 0x0461/0x0010 at 003:002: Access denied (insufficient permissions)
could not open USB device 0x1d6b/0x0002 at 003:001: Access denied (insufficient permissions)
could not open USB device 0x8087/0x0024 at 001:002: Access denied (insufficient permissions)
could not open USB device 0x1d6b/0x0002 at 001:001: Access denied (insufficient permissions)
# Your USB scanner was (probably) detected. It may or may not be supported by
# SANE. Try scanimage -L and read the backend's manpage.
# Not checking for parallel port scanners.
# Most Scanners connected to the parallel port or other proprietary ports
# can't be detected by this program.
# You may want to run this program as root to find all devices. Once you
# found the scanner devices, be sure to adjust access permissions as
# necessary.
答案1
安装 HPLIP-3.17.9 后修复
所有步骤均默认回答，但以下情况除外：它会询问您是否要安装此安装程序安装 hplip 特定策略/配置文件. 键入y. 我建议对所有 hplip 版本都回答 y。
完成：扫描仪和打印机工作正常！