我遇到以下问题：我设置了打印机EPSON 手写笔 SX525WD通过 CUPS。为此，我：
- 访问了 Web 界面http://localhost:631/admin
- 点击“添加打印机”
- 已选择EPSON656CC1 (Epson Stylus SX525WD) (Epson Stylus SX525WD)在发现网络打印机
- 这为我提供了以下地址：dnssd://EPSON656CC1%20(Epson%20Stylus%20SX525WD)._printer._tcp.local/
- 当我完成设置后，打印机会列在打印机Web 界面中的选项卡，状态为闲置的。
但是，当我现在打印页面时，打印机不执行任何操作，状态更改为此时打印机无法访问。
的日志文件/var/log/cups/error_log内容如下：
D [30/Aug/2021:20:31:21 +0200] [Job 5] time-at-processing=1630348281
D [30/Aug/2021:20:31:21 +0200] cupsdMarkDirty(---J-)
D [30/Aug/2021:20:31:21 +0200] cupsdSetBusyState: newbusy="Dirty files", busy="Printing jobs and dirty files"
D [30/Aug/2021:20:31:21 +0200] cupsdSetBusyState: newbusy="Dirty files", busy="Dirty files"
D [30/Aug/2021:20:31:21 +0200] Discarding unused printer-state-changed event...
D [30/Aug/2021:20:31:21 +0200] [Job 5] 3 filters for job:
D [30/Aug/2021:20:31:21 +0200] [Job 5] pdftopdf (application/pdf to application/vnd.cups-pdf, cost 66)
D [30/Aug/2021:20:31:21 +0200] [Job 5] gstoraster (application/vnd.cups-pdf to application/vnd.cups-raster, cost 99)
D [30/Aug/2021:20:31:21 +0200] [Job 5] epson-escpr-wrapper (application/vnd.cups-raster to printer/Epson_Stylus_SX525WD, cost 0)
D [30/Aug/2021:20:31:21 +0200] [Job 5] job-sheets=none,none
D [30/Aug/2021:20:31:21 +0200] [Job 5] argv[0]="Epson_Stylus_SX525WD"
D [30/Aug/2021:20:31:21 +0200] [Job 5] argv[1]="5"
D [30/Aug/2021:20:31:21 +0200] [Job 5] argv[2]="sfuehr"
D [30/Aug/2021:20:31:21 +0200] [Job 5] argv[3]="Bestätigung in zwei Schritten"
D [30/Aug/2021:20:31:21 +0200] [Job 5] argv[4]="1"
D [30/Aug/2021:20:31:21 +0200] [Job 5] argv[5]="EPRendering=None XRXColor=BW INK=MONO SelectColor=Grayscale HPColorMode=GrayscalePrint ProcessColorModel=Mono BRMonoColor=Mono PrintoutMode=Normal.Gray BRPrintQuality=Black Collate Duplex=None ColorMode=Mono media=iso_a4_210x297mm CNIJGrayScale=1 ARCMode=CMBW ColorModel=Gray OKControl=Gray XROutputColor=PrintAsGrayscale BLW=TrueM job-uuid=urn:uuid:51397f87-5e63-3237-63fd-e969d719c5b4 job-originating-host-name=localhost date-time-at-creation= date-time-at-processing= time-at-creation=1630348279 time-at-processing=1630348281 PageSize=A4"
D [30/Aug/2021:20:31:21 +0200] [Job 5] argv[6]="/var/spool/cups/d00005-001"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[0]="CUPS_CACHEDIR=/var/cache/cups"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[1]="CUPS_DATADIR=/usr/share/cups"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[2]="CUPS_DOCROOT=/usr/share/cups/doc"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[3]="CUPS_FONTPATH=/usr/share/cups/fonts"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[4]="CUPS_REQUESTROOT=/var/spool/cups"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[5]="CUPS_SERVERBIN=/usr/lib/cups"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[6]="CUPS_SERVERROOT=/etc/cups"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[7]="CUPS_STATEDIR=/run/cups"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[8]="HOME=/var/spool/cups/tmp"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[9]="PATH=/usr/lib/cups/filter:/usr/bin:/usr/bin:/bin:/usr/bin"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[10]="SERVER_ADMIN=root@thinkpadt490"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[11]="SOFTWARE=CUPS/2.3.3op2"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[12]="TMPDIR=/var/spool/cups/tmp"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[13]="USER=root"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[14]="CUPS_MAX_MESSAGE=2047"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[15]="CUPS_SERVER=/run/cups/cups.sock"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[16]="CUPS_ENCRYPTION=IfRequested"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[17]="IPP_PORT=631"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[18]="CHARSET=utf-8"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[19]="LANG=en_US.UTF-8"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[20]="PPD=/etc/cups/ppd/Epson_Stylus_SX525WD.ppd"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[21]="RIP_MAX_CACHE=128m"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[22]="CONTENT_TYPE=application/pdf"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[23]="DEVICE_URI=dnssd://EPSON656CC1%20(Epson%20Stylus%20SX525WD)._printer._tcp.local/"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[24]="PRINTER_INFO=Epson Stylus SX525WD"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[25]="PRINTER_LOCATION=Tmp"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[26]="PRINTER=Epson_Stylus_SX525WD"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[27]="PRINTER_STATE_REASONS=none"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[28]="CUPS_FILETYPE=document"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[29]="FINAL_CONTENT_TYPE=application/vnd.cups-raster"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[30]="AUTH_I****"
I [30/Aug/2021:20:31:21 +0200] [Job 5] Started filter /usr/lib/cups/filter/pdftopdf (PID 206687)
I [30/Aug/2021:20:31:21 +0200] [Job 5] Started filter /usr/lib/cups/filter/gstoraster (PID 206688)
I [30/Aug/2021:20:31:21 +0200] [Job 5] Started filter /usr/lib/cups/filter/epson-escpr-wrapper (PID 206689)
I [30/Aug/2021:20:31:21 +0200] [Job 5] Started backend /usr/lib/cups/backend/dnssd (PID 206690)
D [30/Aug/2021:20:31:21 +0200] Discarding unused job-state-changed event...
D [30/Aug/2021:20:31:21 +0200] [Job 5] Resolving \"EPSON656CC1 (Epson Stylus SX525WD)._printer._tcp.local\"...
D [30/Aug/2021:20:31:21 +0200] [Job 5] STATE: +connecting-to-device
D [30/Aug/2021:20:31:21 +0200] cupsdMarkDirty(---J-)
D [30/Aug/2021:20:31:21 +0200] cupsdSetBusyState: newbusy="Dirty files", busy="Dirty files"
D [30/Aug/2021:20:31:21 +0200] [Job 5] Resolving \"EPSON656CC1 (Epson Stylus SX525WD)\", regtype=\"_printer._tcp\", domain=\"local.\"...
D [30/Aug/2021:20:31:21 +0200] Discarding unused printer-state-changed event...
D [30/Aug/2021:20:31:21 +0200] [Job 5] pdftopdf: Last filter determined by the PPD: epson-escpr-wrapper; FINAL_CONTENT_TYPE: application/vnd.cups-raster => pdftopdf will not log pages in page_log.
D [30/Aug/2021:20:31:21 +0200] [Job 5] OUTFORMAT=\"<none>\", so output format will be CUPS/PWG Raster
D [30/Aug/2021:20:31:21 +0200] [Job 5] Resolved as \"lpd://EPSON656CC1.local:515/auto\"...
D [30/Aug/2021:20:31:21 +0200] [Job 5] STATE: -connecting-to-device,offline-report
D [30/Aug/2021:20:31:21 +0200] cupsdMarkDirty(---J-)
D [30/Aug/2021:20:31:21 +0200] cupsdSetBusyState: newbusy="Printing jobs and dirty files", busy="Dirty files"
D [30/Aug/2021:20:31:21 +0200] Discarding unused printer-state-changed event...
D [30/Aug/2021:20:31:21 +0200] [Job 5] Executing backend \"/usr/lib/cups/backend/lpd\"...
D [30/Aug/2021:20:31:21 +0200] [Job 5] STATE: +connecting-to-device
D [30/Aug/2021:20:31:21 +0200] cupsdMarkDirty(---J-)
D [30/Aug/2021:20:31:21 +0200] cupsdSetBusyState: newbusy="Dirty files", busy="Printing jobs and dirty files"
D [30/Aug/2021:20:31:21 +0200] [Job 5] Looking up \"EPSON656CC1.local\"...
D [30/Aug/2021:20:31:21 +0200] Discarding unused printer-state-changed event...
D [30/Aug/2021:20:31:21 +0200] [Job 5] PDF interactive form and annotation flattening done via QPDF
D [30/Aug/2021:20:31:21 +0200] [Job 5] PID 206687 (/usr/lib/cups/filter/pdftopdf) exited with no errors.
D [30/Aug/2021:20:31:21 +0200] [Job 5] Color Manager: Calibration Mode/Off
D [30/Aug/2021:20:31:21 +0200] [Job 5] Calling FindDeviceById(cups-Epson_Stylus_SX525WD)
D [30/Aug/2021:20:31:21 +0200] [Job 5] Failed to send: org.freedesktop.DBus.Error.ServiceUnknown:The name org.freedesktop.ColorManager was not provided by any .service files
D [30/Aug/2021:20:31:21 +0200] [Job 5] Failed to get find device cups-Epson_Stylus_SX525WD
D [30/Aug/2021:20:31:21 +0200] [Job 5] Calling FindDeviceById(cups-Epson_Stylus_SX525WD)
D [30/Aug/2021:20:31:21 +0200] [Job 5] Failed to send: org.freedesktop.DBus.Error.ServiceUnknown:The name org.freedesktop.ColorManager was not provided by any .service files
D [30/Aug/2021:20:31:21 +0200] [Job 5] Failed to get device cups-Epson_Stylus_SX525WD
D [30/Aug/2021:20:31:21 +0200] [Job 5] Color Manager: no profiles specified in PPD
D [30/Aug/2021:20:31:21 +0200] cupsdMarkDirty(---J-)
D [30/Aug/2021:20:31:21 +0200] cupsdSetBusyState: newbusy="Dirty files", busy="Dirty files"
D [30/Aug/2021:20:31:21 +0200] [Job 5] Set job-printer-state-message to "Color Manager: no profiles specified in PPD", current level=INFO
D [30/Aug/2021:20:31:21 +0200] [Job 5] Color Manager: ICC Profile: None
D [30/Aug/2021:20:31:21 +0200] Discarding unused job-progress event...
D [30/Aug/2021:20:31:21 +0200] Discarding unused printer-state-changed event...
D [30/Aug/2021:20:31:21 +0200] [Job 5] Ghostscript using Any-Part-of-Pixel method to fill paths.
D [30/Aug/2021:20:31:21 +0200] [Job 5] Ghostscript command line: gs -dQUIET -dSAFER -dNOPAUSE -dBATCH -dNOINTERPOLATE -dNOMEDIAATTRS -dShowAcroForm -sstdout=%stderr -sOutputFile=%stdout -sDEVICE=cups -r360x360 -dDEVICEWIDTHPOINTS=595 -dDEVICEHEIGHTPOINTS=841 -dcupsBitsPerColor=8 -dcupsColorOrder=0 -dcupsColorSpace=0 -dcupsCompression=1 -scupsPageSizeName=A4 -I/usr/share/cups/fonts -c \'<</.HWMargins[8.400000 8.400000 8.400024 8.399963] /Margins[0 0]>>setpagedevice\' -f -_
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[0]=\"CUPS_CACHEDIR=/var/cache/cups\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[1]=\"CUPS_DATADIR=/usr/share/cups\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[2]=\"CUPS_DOCROOT=/usr/share/cups/doc\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[3]=\"CUPS_FONTPATH=/usr/share/cups/fonts\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[4]=\"CUPS_REQUESTROOT=/var/spool/cups\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[5]=\"CUPS_SERVERBIN=/usr/lib/cups\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[6]=\"CUPS_SERVERROOT=/etc/cups\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[7]=\"CUPS_STATEDIR=/run/cups\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[8]=\"HOME=/var/spool/cups/tmp\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[9]=\"PATH=/usr/lib/cups/filter:/usr/bin:/usr/bin:/bin:/usr/bin\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[10]=\"SERVER_ADMIN=root@thinkpadt490\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[11]=\"SOFTWARE=CUPS/2.3.3op2\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[12]=\"TMPDIR=/var/spool/cups/tmp\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[13]=\"USER=root\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[14]=\"CUPS_MAX_MESSAGE=2047\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[15]=\"CUPS_SERVER=/run/cups/cups.sock\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[16]=\"CUPS_ENCRYPTION=IfRequested\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[17]=\"IPP_PORT=631\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[18]=\"CHARSET=utf-8\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[19]=\"LANG=en_US.UTF-8\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[20]=\"PPD=/etc/cups/ppd/Epson_Stylus_SX525WD.ppd\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[21]=\"RIP_MAX_CACHE=128m\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[22]=\"CONTENT_TYPE=application/pdf\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[23]=\"DEVICE_URI=dnssd://EPSON656CC1%20(Epson%20Stylus%20SX525WD)._printer._tcp.local/\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[24]=\"PRINTER_INFO=Epson Stylus SX525WD\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[25]=\"PRINTER_LOCATION=Tmp\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[26]=\"PRINTER=Epson_Stylus_SX525WD\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[27]=\"PRINTER_STATE_REASONS=none\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[28]=\"CUPS_FILETYPE=document\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[29]=\"FINAL_CONTENT_TYPE=application/vnd.cups-raster\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] envp[30]=\"AUTH_INFO_REQUIRED=none\"
D [30/Aug/2021:20:31:21 +0200] [Job 5] Start rendering...
D [30/Aug/2021:20:31:21 +0200] cupsdMarkDirty(---J-)
D [30/Aug/2021:20:31:21 +0200] cupsdSetBusyState: newbusy="Dirty files", busy="Dirty files"
D [30/Aug/2021:20:31:21 +0200] [Job 5] Set job-printer-state-message to "Start rendering...", current level=INFO
D [30/Aug/2021:20:31:21 +0200] [Job 5] Processing page 1...
D [30/Aug/2021:20:31:21 +0200] cupsdMarkDirty(---J-)
D [30/Aug/2021:20:31:21 +0200] cupsdSetBusyState: newbusy="Dirty files", busy="Dirty files"
D [30/Aug/2021:20:31:21 +0200] [Job 5] Set job-printer-state-message to "Processing page 1...", current level=INFO
D [30/Aug/2021:20:31:21 +0200] Discarding unused job-progress event...
D [30/Aug/2021:20:31:21 +0200] Discarding unused printer-state-changed event...
D [30/Aug/2021:20:31:22 +0200] [Job 5] Processing page 2...
D [30/Aug/2021:20:31:22 +0200] cupsdMarkDirty(---J-)
D [30/Aug/2021:20:31:22 +0200] cupsdSetBusyState: newbusy="Dirty files", busy="Dirty files"
D [30/Aug/2021:20:31:22 +0200] [Job 5] Set job-printer-state-message to "Processing page 2...", current level=INFO
D [30/Aug/2021:20:31:22 +0200] Discarding unused job-progress event...
D [30/Aug/2021:20:31:22 +0200] Discarding unused printer-state-changed event...
D [30/Aug/2021:20:31:22 +0200] [Job 4] Unloading...
D [30/Aug/2021:20:31:22 +0200] [Job 5] Processing page 3...
D [30/Aug/2021:20:31:22 +0200] cupsdMarkDirty(---J-)
D [30/Aug/2021:20:31:22 +0200] cupsdSetBusyState: newbusy="Dirty files", busy="Dirty files"
D [30/Aug/2021:20:31:22 +0200] [Job 5] Set job-printer-state-message to "Processing page 3...", current level=INFO
D [30/Aug/2021:20:31:22 +0200] Discarding unused job-progress event...
D [30/Aug/2021:20:31:22 +0200] Discarding unused printer-state-changed event...
D [30/Aug/2021:20:31:22 +0200] [Job 5] Rendering completed
D [30/Aug/2021:20:31:22 +0200] cupsdMarkDirty(---J-)
D [30/Aug/2021:20:31:22 +0200] cupsdSetBusyState: newbusy="Dirty files", busy="Dirty files"
D [30/Aug/2021:20:31:22 +0200] [Job 5] Set job-printer-state-message to "Rendering completed", current level=INFO
D [30/Aug/2021:20:31:22 +0200] Discarding unused job-progress event...
D [30/Aug/2021:20:31:22 +0200] Discarding unused printer-state-changed event...
D [30/Aug/2021:20:31:22 +0200] [Job 5] PID 206688 (/usr/lib/cups/filter/gstoraster) exited with no errors.
D [30/Aug/2021:20:31:26 +0200] [Job 5] STATE: -connecting-to-device
D [30/Aug/2021:20:31:26 +0200] cupsdMarkDirty(---J-)
D [30/Aug/2021:20:31:26 +0200] cupsdSetBusyState: newbusy="Printing jobs and dirty files", busy="Dirty files"
D [30/Aug/2021:20:31:26 +0200] [Job 5] EPSON656CC1.local=192.168.0.166
D [30/Aug/2021:20:31:26 +0200] [Job 5] backendWaitLoop(snmp_fd=6, addr=0x55c32cc49ad8, side_cb=0x55c32bd531d0)
D [30/Aug/2021:20:31:26 +0200] Discarding unused printer-state-changed event...
D [30/Aug/2021:20:31:26 +0200] [Job 5] Copying print data.
D [30/Aug/2021:20:31:26 +0200] cupsdMarkDirty(---J-)
D [30/Aug/2021:20:31:26 +0200] cupsdSetBusyState: newbusy="Printing jobs and dirty files", busy="Printing jobs and dirty files"
D [30/Aug/2021:20:31:26 +0200] [Job 5] Set job-printer-state-message to "Copying print data.", current level=INFO
D [30/Aug/2021:20:31:26 +0200] Discarding unused job-progress event...
D [30/Aug/2021:20:31:26 +0200] Discarding unused printer-state-changed event...
D [30/Aug/2021:20:31:26 +0200] [Job 5] backendRunLoop(print_fd=-1, device_fd=7, snmp_fd=6, addr=0x55c32cc49ad8, use_bc=0, side_cb=0x55c32bd531d0)
D [30/Aug/2021:20:31:26 +0200] [Job 5] Read 8192 bytes of print data...
I [30/Aug/2021:20:31:28 +0200] Saving job.cache...
D [30/Aug/2021:20:31:28 +0200] cupsdSetBusyState: newbusy="Printing jobs", busy="Printing jobs and dirty files"
D [30/Aug/2021:20:31:30 +0200] [Job 5] prtGeneralCurrentLocalization type is 0, expected 2!
D [30/Aug/2021:20:31:30 +0200] [Job 5] Wrote 8192 bytes of print data...
... A lot of those lines ...
D [30/Aug/2021:20:31:31 +0200] [Job 5] PID 206689 (/usr/lib/cups/filter/epson-escpr-wrapper) exited with no errors.
D [30/Aug/2021:20:31:31 +0200] [Job 5] Connecting to EPSON656CC1.local:515 for printer auto
D [30/Aug/2021:20:31:31 +0200] [Job 5] Connecting to printer.
D [30/Aug/2021:20:31:31 +0200] cupsdMarkDirty(---J-)
D [30/Aug/2021:20:31:31 +0200] cupsdSetBusyState: newbusy="Printing jobs and dirty files", busy="Printing jobs"
D [30/Aug/2021:20:31:31 +0200] [Job 5] Set job-printer-state-message to "Connecting to printer.", current level=INFO
D [30/Aug/2021:20:31:31 +0200] Discarding unused job-progress event...
D [30/Aug/2021:20:31:31 +0200] Discarding unused printer-state-changed event...
D [30/Aug/2021:20:31:34 +0200] [Job 5] Connection error: No route to host
W [30/Aug/2021:20:31:34 +0200] [Job 5] The printer is unreachable at this time.
D [30/Aug/2021:20:31:34 +0200] cupsdMarkDirty(---J-)
D [30/Aug/2021:20:31:34 +0200] cupsdSetBusyState: newbusy="Printing jobs and dirty files", busy="Printing jobs and dirty files"
D [30/Aug/2021:20:31:34 +0200] [Job 5] Set job-printer-state-message to "The printer is unreachable at this time.", current level=WARN
D [30/Aug/2021:20:31:34 +0200] Discarding unused job-progress event...
D [30/Aug/2021:20:31:34 +0200] Discarding unused printer-state-changed event...
D [30/Aug/2021:20:31:34 +0200] Report: clients=2
D [30/Aug/2021:20:31:34 +0200] Report: jobs=4
D [30/Aug/2021:20:31:34 +0200] Report: jobs-active=1
D [30/Aug/2021:20:31:34 +0200] Report: printers=1
D [30/Aug/2021:20:31:34 +0200] Report: stringpool-string-count=642
D [30/Aug/2021:20:31:34 +0200] Report: stringpool-alloc-bytes=10232
D [30/Aug/2021:20:31:34 +0200] Report: stringpool-total-bytes=12152
D [30/Aug/2021:20:31:42 +0200] [Job 5] Connection error: No route to host
W [30/Aug/2021:20:31:42 +0200] [Job 5] The printer is unreachable at this time.
D [30/Aug/2021:20:31:55 +0200] [Job 5] Connection error: No route to host
W [30/Aug/2021:20:31:55 +0200] [Job 5] The printer is unreachable at this time.
I [30/Aug/2021:20:32:02 +0200] Saving job.cache...
D [30/Aug/2021:20:32:02 +0200] cupsdSetBusyState: newbusy="Printing jobs", busy="Printing jobs and dirty files"
D [30/Aug/2021:20:32:13 +0200] [Job 5] Connection error: No route to host
W [30/Aug/2021:20:32:13 +0200] [Job 5] The printer is unreachable at this time.
D [30/Aug/2021:20:32:36 +0200] [Job 5] Connection error: No route to host
W [30/Aug/2021:20:32:36 +0200] [Job 5] The printer is unreachable at this time.
D [30/Aug/2021:20:32:36 +0200] Report: clients=2
D [30/Aug/2021:20:32:36 +0200] Report: jobs=4
D [30/Aug/2021:20:32:36 +0200] Report: jobs-active=1
D [30/Aug/2021:20:32:36 +0200] Report: printers=1
D [30/Aug/2021:20:32:36 +0200] Report: stringpool-string-count=642
D [30/Aug/2021:20:32:36 +0200] Report: stringpool-alloc-bytes=10232
D [30/Aug/2021:20:32:36 +0200] Report: stringpool-total-bytes=12152
D [30/Aug/2021:20:33:04 +0200] [Job 5] Connection error: No route to host
W [30/Aug/2021:20:33:04 +0200] [Job 5] The printer is unreachable at this time.
D [30/Aug/2021:20:33:37 +0200] [Job 5] Connection error: No route to host
W [30/Aug/2021:20:33:37 +0200] [Job 5] The printer is unreachable at this time.
D [30/Aug/2021:20:33:37 +0200] Report: clients=2
D [30/Aug/2021:20:33:37 +0200] Report: jobs=4
D [30/Aug/2021:20:33:37 +0200] Report: jobs-active=1
D [30/Aug/2021:20:33:37 +0200] Report: printers=1
D [30/Aug/2021:20:33:37 +0200] Report: stringpool-string-count=642
D [30/Aug/2021:20:33:37 +0200] Report: stringpool-alloc-bytes=10232
D [30/Aug/2021:20:33:37 +0200] Report: stringpool-total-bytes=12152
D [30/Aug/2021:20:34:10 +0200] [Job 5] Connection error: No route to host
W [30/Aug/2021:20:34:10 +0200] [Job 5] The printer is unreachable at this time.
D [30/Aug/2021:20:34:43 +0200] [Job 5] Connection error: No route to host
W [30/Aug/2021:20:34:43 +0200] [Job 5] The printer is unreachable at this time.
D [30/Aug/2021:20:34:43 +0200] Report: clients=2
D [30/Aug/2021:20:34:43 +0200] Report: jobs=4
D [30/Aug/2021:20:34:43 +0200] Report: jobs-active=1
D [30/Aug/2021:20:34:43 +0200] Report: printers=1
D [30/Aug/2021:20:34:43 +0200] Report: stringpool-string-count=642
D [30/Aug/2021:20:34:43 +0200] Report: stringpool-alloc-bytes=10232
D [30/Aug/2021:20:34:43 +0200] Report: stringpool-total-bytes=12152
D [30/Aug/2021:20:35:16 +0200] [Job 5] Connection error: No route to host
W [30/Aug/2021:20:35:16 +0200] [Job 5] The printer is unreachable at this time.
D [30/Aug/2021:20:35:49 +0200] [Job 5] Connection error: No route to host
W [30/Aug/2021:20:35:49 +0200] [Job 5] The printer is unreachable at this time.
D [30/Aug/2021:20:35:49 +0200] cupsdAddCert: Adding certificate for PID 0
D [30/Aug/2021:20:35:49 +0200] Report: clients=2
D [30/Aug/2021:20:35:49 +0200] Report: jobs=4
D [30/Aug/2021:20:35:49 +0200] Report: jobs-active=1
D [30/Aug/2021:20:35:49 +0200] Report: printers=1
D [30/Aug/2021:20:35:49 +0200] Report: stringpool-string-count=642
D [30/Aug/2021:20:35:49 +0200] Report: stringpool-alloc-bytes=10232
D [30/Aug/2021:20:35:49 +0200] Report: stringpool-total-bytes=12152
D [30/Aug/2021:20:36:22 +0200] [Job 5] Connection error: No route to host
W [30/Aug/2021:20:36:22 +0200] [Job 5] The printer is unreachable at this time.
D [30/Aug/2021:20:36:44 +0200] [Client 125] HTTP_STATE_WAITING Closing for error 32 (Broken pipe)
D [30/Aug/2021:20:36:44 +0200] [Client 125] Closing connection.
D [30/Aug/2021:20:36:44 +0200] cupsdSetBusyState: newbusy="Printing jobs", busy="Printing jobs"
D [30/Aug/2021:20:36:55 +0200] [Job 5] Connection error: No route to host
W [30/Aug/2021:20:36:55 +0200] [Job 5] The printer is unreachable at this time.
D [30/Aug/2021:20:36:55 +0200] Report: clients=1
D [30/Aug/2021:20:36:55 +0200] Report: jobs=4
D [30/Aug/2021:20:36:55 +0200] Report: jobs-active=1
D [30/Aug/2021:20:36:55 +0200] Report: printers=1
D [30/Aug/2021:20:36:55 +0200] Report: stringpool-string-count=642
D [30/Aug/2021:20:36:55 +0200] Report: stringpool-alloc-bytes=10232
D [30/Aug/2021:20:36:55 +0200] Report: stringpool-total-bytes=12152
D [30/Aug/2021:20:37:28 +0200] [Job 5] Connection error: No route to host
W [30/Aug/2021:20:37:28 +0200] [Job 5] The printer is unreachable at this time.
D [30/Aug/2021:20:38:01 +0200] [Job 5] Connection error: No route to host
W [30/Aug/2021:20:38:01 +0200] [Job 5] The printer is unreachable at this time.
D [30/Aug/2021:20:38:01 +0200] Report: clients=1
D [30/Aug/2021:20:38:01 +0200] Report: jobs=4
D [30/Aug/2021:20:38:01 +0200] Report: jobs-active=1
D [30/Aug/2021:20:38:01 +0200] Report: printers=1
D [30/Aug/2021:20:38:01 +0200] Report: stringpool-string-count=642
D [30/Aug/2021:20:38:01 +0200] Report: stringpool-alloc-bytes=10232
D [30/Aug/2021:20:38:01 +0200] Report: stringpool-total-bytes=12152
D [30/Aug/2021:20:38:34 +0200] [Job 5] Connection error: No route to host
W [30/Aug/2021:20:38:34 +0200] [Job 5] The printer is unreachable at this time.
D [30/Aug/2021:20:39:07 +0200] [Job 5] Connection error: No route to host
W [30/Aug/2021:20:39:07 +0200] [Job 5] The printer is unreachable at this time.
D [30/Aug/2021:20:39:07 +0200] Report: clients=1
D [30/Aug/2021:20:39:07 +0200] Report: jobs=4
D [30/Aug/2021:20:39:07 +0200] Report: jobs-active=1
D [30/Aug/2021:20:39:07 +0200] Report: printers=1
D [30/Aug/2021:20:39:07 +0200] Report: stringpool-string-count=642
D [30/Aug/2021:20:39:07 +0200] Report: stringpool-alloc-bytes=10232
D [30/Aug/2021:20:39:07 +0200] Report: stringpool-total-bytes=12152
D [30/Aug/2021:20:39:40 +0200] [Job 5] Connection error: No route to host
W [30/Aug/2021:20:39:40 +0200] [Job 5] The printer is unreachable at this time.
ping 192.168.0.166通过（我通过访问打印机本身的接口获取 IP 地址）对打印机执行 ping 操作会导致错误消息目标主机不可达。
运行traceroute 192.168.0.166回报1 thinkpadt490 (192.168.0.109) 3033.085 毫秒 !H 3033.044 毫秒 !H 3033.027 毫秒 !H。
lpstat -t返回以下内容：
scheduler is running
system default destination: Epson_Stylus_SX525WD
device for Epson_Stylus_SX525WD: dnssd://EPSON656CC1%20(Epson%20Stylus%20SX525WD)._printer._tcp.local/
Epson_Stylus_SX525WD accepting requests since Mon 30 Aug 2021 08:31:21 PM CEST
printer Epson_Stylus_SX525WD now printing Epson_Stylus_SX525WD-5. enabled since Mon 30 Aug 2021 08:31:21 PM CEST
The printer is unreachable at this time.
Epson_Stylus_SX525WD-5 sfuehr 111616 Mon 30 Aug 2021 08:31:19 PM CEST
因此，目前我很困惑为什么我在 ping 打印机时无法连接到打印机，但在添加新打印机以及运行lpstat -t.有人对接下来要尝试什么有什么建议吗？我找不到类似的东西https://wiki.archlinux.org/title/CUPS/Troubleshooting我真的不明白如何看待结果traceroute。
任何帮助深表感谢 ：）
答案1
您的打印机 URI 以 DNSSD 开头，我相信这意味着它正在尝试使用 Bonjour 协议与打印机通信。
因此，接下来要尝试的事情是验证您是否已安装 Bonjour 并在您的系统上运行。