我尝试让 HP M280nw 扫描仪工作，但没有成功。我尝试过不同的操作系统，但是，运行效果较好的是 19.10。
打印机没有任何问题，但是扫描仪却出问题了。
以下报告是使用默认的 19.10 HP 包执行的；安装新的包不会产生任何有意义的效果（自 3.18.5 起支持扫描）。
该程序simple-scan检测到扫描仪，但在尝试启动扫描时抛出错误。
$ lsb_release --all
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 19.10
Release: 19.10
Codename: eoan
$ apt search 'libusb-|hpaio' | grep installed
hplip/eoan,now 3.19.6+dfsg0-1ubuntu1 amd64 [installed,automatic]
libsane-hpaio/eoan,now 3.19.6+dfsg0-1ubuntu1 amd64 [installed,automatic]
libusb-1.0-0/eoan,now 2:1.0.23-1 amd64 [installed]
$ dmesg -w
[ 741.512933] usb 3-2: USB disconnect, device number 4
[ 744.814194] usb 1-10: new high-speed USB device number 9 using xhci_hcd
[ 745.063489] usb 1-10: New USB device found, idVendor=03f0, idProduct=ad2a, bcdDevice= 1.00
[ 745.063492] usb 1-10: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 745.063493] usb 1-10: Product: HP ColorLaserJet MFP M278-M281
[ 745.063494] usb 1-10: Manufacturer: HP
[ 745.063495] usb 1-10: SerialNumber: <SERIALHERE>
[ 745.167646] usblp 1-10:1.0: usblp0: USB Bidirectional printer dev 9 if 0 alt 0 proto 2 vid 0x03F0 pid 0xAD2A
$ scanimage
scanimage: open of device hpaio:/usb/HP_ColorLaserJet_MFP_M278-M281?serial=<SERIALHERE> failed: Error during device I/O
$ dmesg -w | tail -n 1
[ 828.364816] usblp0: removed
# Now, I unplug and plug the printer
$ sudo 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.
could not fetch string descriptor: Pipe error
could not fetch string descriptor: Pipe error
found USB scanner (vendor=0x03f0 [HP], product=0xad2a [HP ColorLaserJet MFP M278-M281]) at libusb:001:009
# 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.
$ scanimage -L
device `hpaio:/usb/HP_ColorLaserJet_MFP_M278-M281?serial=<SERIALHERE>' is a Hewlett-Packard HP_ColorLaserJet_MFP_M278-M281 all-in-one
$ hp-check -r
# output cut
PYEXT SCANCONF QUEUES PERMISSION
Status Types:
OK
MISSING - Missing Dependency or Permission or Plug-in
INCOMPAT - Incompatible dependency-version or Plugin-version
warning: ubuntu-19.10 version is not supported. Using ubuntu-19.04 versions dependencies to verify and install...
---------------
| SYSTEM INFO |
---------------
Kernel: 5.3.0-18-generic #19-Ubuntu SMP Tue Oct 8 20:14:06 UTC 2019 GNU/Linux
Host: ubuntu
Proc: 5.3.0-18-generic #19-Ubuntu SMP Tue Oct 8 20:14:06 UTC 2019 GNU/Linux
Distribution: ubuntu 19.10
Bitness: 64 bit
-----------------------
| HPLIP CONFIGURATION |
-----------------------
HPLIP-Version: HPLIP 3.19.6
HPLIP-Home: /usr/share/hplip
warning: HPLIP-Installation: Auto installation is not supported for ubuntu distro 19.10 version
Current contents of '/etc/hp/hplip.conf' file:
# hplip.conf. Generated from hplip.conf.in by configure.
[hplip]
version=3.19.6
[dirs]
home=/usr/share/hplip
run=/var/run
ppd=/usr/share/ppd/hplip/HP
ppdbase=/usr/share/ppd/hplip
doc=/usr/share/doc/hplip
html=/usr/share/doc/hplip-doc
icon=no
cupsbackend=/usr/lib/cups/backend
cupsfilter=/usr/lib/cups/filter
drv=/usr/share/cups/drv
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=yes
foomatic-drv-install=yes
foomatic-ppd-install=no
foomatic-rip-hplip-install=no
hpcups-install=yes
cups-drv-install=yes
cups-ppd-install=no
internal-tag=3.19.6
restricted-build=no
ui-toolkit=qt5
qt3=no
qt4=no
qt5=yes
policy-kit=yes
lite-build=no
udev_sysfs_rules=no
hpcups-only-build=no
hpijs-only-build=no
apparmor_build=no
class-driver=no
Current contents of '/var/lib/hp/hplip.state' file:
Plugins are not installed. Could not access file: No such file or directory
Current contents of '~/.hplip/hplip.conf' file:
[installation]
date_time = 11/08/19 20:41:54
version = 3.19.6
<Package-name> <Package-Desc> <Required/Optional> <Min-Version> <Installed-Version> <Status> <Comment>
-------------------------
| External Dependencies |
-------------------------
error: cups CUPS - Common Unix Printing System REQUIRED 1.1 - INCOMPAT 'CUPS may not be installed or not running'
gs GhostScript - PostScript and PDF language interpreter and previewer REQUIRED 7.05 9.27 OK -
error: xsane xsane - Graphical scanner frontend for SANE OPTIONAL 0.9 - MISSING 'xsane needs to be installed'
scanimage scanimage - Shell scanning program OPTIONAL 1.0 1.0.27 OK -
error: dbus DBus - Message bus system REQUIRED - 1.12.14 MISSING 'DBUS may not be installed or not running'
policykit PolicyKit - Administrative policy framework OPTIONAL - 0.105 OK -
network network -wget OPTIONAL - 1.20.3 OK -
avahi-utils avahi-utils OPTIONAL - 0.7 OK -
------------------------
| General Dependencies |
------------------------
error: libjpeg libjpeg - JPEG library REQUIRED - - MISSING 'libjpeg needs to be installed'
error: cups-devel CUPS devel- Common Unix Printing System development files REQUIRED - - MISSING 'cups-devel needs to be installed'
error: cups-image CUPS image - CUPS image development files REQUIRED - - MISSING 'cups-image needs to be installed'
libpthread libpthread - POSIX threads library REQUIRED - b'2.30' OK -
error: libusb libusb - USB library REQUIRED - 1.0 MISSING 'libusb needs to be installed'
sane SANE - Scanning library REQUIRED - - OK -
error: sane-devel SANE - Scanning library development files REQUIRED - - MISSING 'sane-devel needs to be installed'
error: libnetsnmp-devel libnetsnmp-devel - SNMP networking library development files REQUIRED 5.0.9 - MISSING 'libnetsnmp-devel needs to be installed'
error: libcrypto libcrypto - OpenSSL cryptographic library REQUIRED - 1.1.1 MISSING 'libcrypto needs to be installed'
python3X Python 2.2 or greater - Python programming language REQUIRED 2.2 3.7.5 OK -
error: python3-notify2 Python libnotify - Python bindings for the libnotify Desktop notifications OPTIONAL - - MISSING 'python3-notify2 needs to be installed'
error: python3-pyqt4-dbus PyQt 4 DBus - DBus Support for PyQt4 OPTIONAL 4.0 - MISSING 'python3-pyqt4-dbus needs to be installed'
error: python3-pyqt4 PyQt 4- Qt interface for Python (for Qt version 4.x) REQUIRED 4.0 - MISSING 'python3-pyqt4 needs to be installed'
python3-dbus Python DBus - Python bindings for DBus REQUIRED 0.80.0 1.2.12 OK -
python3-xml Python XML libraries REQUIRED - 2.2.7 OK -
error: python3-devel Python devel - Python development files REQUIRED 2.2 3.7.5 MISSING 'python3-devel needs to be installed'
Traceback (most recent call last):
File "/usr/bin/hp-check", line 862, in <module>
num_errors, num_warns = dep.validate(time_flag, is_quiet_mode)
File "/usr/bin/hp-check", line 368, in validate
self.core.dependencies[dep])
File "/usr/bin/hp-check", line 210, in __update_deps_info
installed_ver = self.core.version_func[deps_info[6]]()
File "/usr/share/hplip/installer/dcheck.py", line 372, in get_pil_version
return Image.VERSION
AttributeError: module 'PIL.Image' has no attribute 'VERSION'
答案1
大约两年后，我再次尝试，这次使用 MFP M183fw。
我现在使用的是 20.04，它附带 3.20.3 版 hplip。现在一切都按预期工作，但是，我之前（我认为）不知道的是专有插件 ( hp-plugin -i) 的安装。
如果我不在新配置上安装插件，扫描仪的行为就会像问题中的那样 - 扫描仪被检测到，但扫描时出错。
基于上述情况，我猜测我没有安装该插件。
答案2
这里有两个问题：
PIL.Image 版本的问题是一个打包依赖错误 - 我将其报告为错误 1851918
扫描仪的问题可能与 Python 成像有关，但即使二进制 HPLIP 安装程序也无法找到并安装正确的版本：
安装缺少的可选依赖项
...
警告：选项“扫描”缺少可选依赖项：pil（PIL - Python 图像库（使用 hp-scan 进行命令行扫描所需））
警告：此安装程序无法为您的发行版/操作系统和/或版本安装“pil”。正在运行 SCANJET 依赖命令
...
sudo apt-get install --assume-yes python-zbar (Scanjet-depend 步骤 9)
警告：无法安装此 Scanjet 依赖包。某些 Scanjet 功能将无法使用。因此即使使用来自 HPLIP 站点的二进制 hplip 安装程序，扫描也无法进行。
最后，我建议安装 Ubuntu 18.04 LTS 以避免所有这一切噩梦。