Ubuntu 16.04：简单扫描I / O错误
在尝试使用简单扫描进行扫描时，我经常（但并非总是！）得到I / O错误，告诉我扫描仪无法访问。 我不认为这是物理连接问题（电缆或USB端口问题），因为使用相同设备进行打印可以正常工作。
我正在使用Ubuntu 16.4。 我的设备是三星SCX-3205W。 我已经从生产者网站安装了最新的驱动程序。
这是简单扫描的控制台输出：
$ simple-scan -d [+0,00s] DEBUG: simple-scan.vala:674: Starting Simple Scan 3.20.0, PID=3395 [+0,00s] DEBUG: Connecting to session manager [+0,08s] DEBUG: ui.vala:2032: Loading state from /home/ja/.cache/simple-scan/state [+0,08s] DEBUG: ui.vala:1995: Restoring window to 600x400 pixels [+0,08s] DEBUG: autosave-manager.vala:64: Loading autosave information [+0,08s] DEBUG: autosave-manager.vala:259: Waiting to autosave... [+0,08s] CRITICAL: gtk_event_controller_reset: assertion 'GTK_IS_EVENT_CONTROLLER (controller)' failed [+0,15s] DEBUG: scanner.vala:1447: sane_init () -> SANE_STATUS_GOOD [+0,15s] DEBUG: scanner.vala:1453: SANE version 1.0.25 [+0,15s] DEBUG: scanner.vala:1514: Requesting redetection of scan devices [+0,15s] DEBUG: scanner.vala:803: Processing request [+0,19s] DEBUG: autosave-manager.vala:281: Autosaving book information [+0,28s] DEBUG: ui.vala:2124: Saving state to /home/ja/.cache/simple-scan/state [+2,23s] DEBUG: ui.vala:2124: Saving state to /home/ja/.cache/simple-scan/state [+7,51s] DEBUG: scanner.vala:338: sane_get_devices () -> SANE_STATUS_GOOD [+7,51s] DEBUG: scanner.vala:350: Device: name="smfp:usb;04e8;3441;Z5E6BFEB501435J" vendor="Samsung" model="SCX-3200 Series on USB" type="Scanner" [+10,86s] DEBUG: ui.vala:2124: Saving state to /home/ja/.cache/simple-scan/state [+15,60s] DEBUG: ui.vala:2124: Saving state to /home/ja/.cache/simple-scan/state [+15,76s] DEBUG: ui.vala:2124: Saving state to /home/ja/.cache/simple-scan/state [+16,50s] DEBUG: simple-scan.vala:404: Requesting scan at 300 dpi from device 'smfp:usb;04e8;3441;Z5E6BFEB501435J' [+16,50s] DEBUG: scanner.vala:1560: Scanner.scan ("smfp:usb;04e8;3441;Z5E6BFEB501435J", dpi=300, scan_mode=ScanMode.COLOR, depth=8, type=ScanType.SINGLE, paper_width=0, paper_height=0, brightness=0, contrast=0) [+16,50s] DEBUG: scanner.vala:803: Processing request [+16,53s] DEBUG: ui.vala:2124: Saving state to /home/ja/.cache/simple-scan/state [+16,68s] DEBUG: ui.vala:2124: Saving state to /home/ja/.cache/simple-scan/state [+19,40s] DEBUG: ui.vala:2124: Saving state to /home/ja/.cache/simple-scan/state [+50,73s] DEBUG: scanner.vala:864: sane_open ("smfp:usb;04e8;3441;Z5E6BFEB501435J") -> SANE_STATUS_IO_ERROR [+50,73s] WARNING: scanner.vala:868: Unable to get open device: Error during device I/O [+51,10s] DEBUG: ui.vala:2124: Saving state to /home/ja/.cache/simple-scan/state [+115,09s] DEBUG: ui.vala:2124: Saving state to /home/ja/.cache/simple-scan/state [+116,12s] DEBUG: ui.vala:2124: Saving state to /home/ja/.cache/simple-scan/state [+117,44s] DEBUG: autosave-manager.vala:195: Deleting autosave records [+117,44s] DEBUG: scanner.vala:1587: Stopping scan thread [+117,44s] DEBUG: scanner.vala:803: Processing request [+117,44s] DEBUG: scanner.vala:1598: sane_exit () 在撰写本文时，需要下载并安装这3个软件包。
libsane-common_1.0.26~git20151121-1_all.deb libsane_1.0.26~git20151121-1_amd64.deb libjpeg62-turbo_1.5.1-1_amd64.deb
前两个包可以在Debian实验库中找到此链接https://packages.debian.org/experimental/libs/
我在这个链接中找到的最后一个包https://packages.debian.org/sid/libjpeg62-turbo
在某些情况下，您可能需要导航到ftp镜像站点才能实际下载。 下载后，只需以root身份安装每个软件包，即sudo dpkg -i package
我已经使用simple-scan，xsane和scangearmp进行了测试，一切正常。
install libsane-common_1.0.26~git20151121-1_all install libsane_1.0.26~git20151121-1_amd64 install libjpeg62-turbo_1.5.1-1_amd64 Loaded repository http://ftp.ports.debian.org/debian-ports/ synaptic only comes up with 1.0.27-1 experimental2 for sane-common. No libsane option. Unable to find the link https://packages.debian.org/sid/libjpeg62-turbo
添加了源url和synaptic显示
The repository may no longer be available or could not be contacted because of network problems. If available an older version of the failed index will be used. Otherwise the repository will be ignored. Check your network connection and ensure the repository address in the preferences is correct.
不得不删除存储库并重新安装libsane libsane-common sane和simple-scan