状态:打印机此时可能不存在或不可用

Question

突然之间，我的打印作业不再是网络打印机的“处理”状态。

当我平我的打印机IP，我得到一个响应，所以网络连接是可用的。TCP端口也是开放的(参见下面)。

$ lpstat -l
RICOH-Aficio-SP-3510DN-54 bram            102400   Tue 31 May 2022 09:34:47 AM
    Status: The printer may not exist or is unavailable at this time.
    Alerts: job-printing
    queued for RICOH-Aficio-SP-3510DN

两天前打印机运转良好。我开了打印机和电脑的电源。

~$ sudo /usr/lib/cups/backend/dnssd
DEBUG: Querying "RICOH\032Aficio\032SP\0323510DN\032\04075a879\041._ipp._tcp.local"...
DEBUG: Querying "RICOH\032Aficio\032SP\0323510DN\032\04075a879\041._pdl-datastream._tcp.local"...
DEBUG: Querying "RICOH\032Aficio\032SP\0323510DN\032\04075a879\041._printer._tcp.local"...
DEBUG: sent=0, count=3
DEBUG2: query_callback(browser=0x5561e7b64290, interfaceIndex=2, protocol=1, event=0, fullName="RICOH\032Aficio\032SP\0323510DN\032\04075a879\041._ipp._tcp.local", rrclass=1, rrtype=16, rdata=0x5561e7b64958, rdlen=291, flags=5, context=0x5561e7b63550)
DEBUG2: query_callback: "txtvers=1".
DEBUG2: query_callback: "rp=ipp/port1".
DEBUG2: query_callback: "note=local.".
DEBUG2: query_callback: "qtotal=1".
DEBUG2: query_callback: "priority=50".
DEBUG2: query_callback: "ty=RICOH Aficio SP 3510DN (75a879)".
DEBUG2: query_callback: "product=(RICOH Aficio SP 3510DN)".
DEBUG2: query_callback: "pdl=application/postscript,application/vnd.hp-PCL,application/vnd.hp-PCLXL,text/plain".
DEBUG2: query_callback: "adminurl=http://3510DN-75A879.local".
DEBUG2: query_callback: "usb_MFG=RICOH".
DEBUG2: query_callback: "usb_MDL=RICOH Aficio SP 3510DN".
DEBUG2: query_callback(browser=0x5561e7b64290, interfaceIndex=2, protocol=0, event=0, fullName="RICOH\032Aficio\032SP\0323510DN\032\04075a879\041._ipp._tcp.local", rrclass=1, rrtype=16, rdata=0x5561e7b64958, rdlen=291, flags=5, context=0x5561e7b63550)
...

注意:来自dnssd的上述信息重复了3次，不确定原因。

此外，nmap报告说，服务是可用的：

$ nmap 10.0.1.3
Starting Nmap 7.80 ( https://nmap.org ) at 2022-05-31 11:07 PDT
Nmap scan report for 10.0.1.3
Host is up (0.0011s latency).
Not shown: 995 closed ports
PORT     STATE SERVICE
21/tcp   open  ftp
80/tcp   open  http
515/tcp  open  printer
631/tcp  open  ipp
9100/tcp open  jetdirect

Nmap done: 1 IP address (1 host up) scanned in 3.30 seconds

CUPS服务正在运行：

$ systemctl status cups
● cups.service - CUPS Scheduler
     Loaded: loaded (/lib/systemd/system/cups.service; enabled; vendor preset: enabled)
     Active: active (running) since Tue 2022-05-31 11:04:55 PDT; 21min ago
TriggeredBy: ● cups.path
             ● cups.socket
       Docs: man:cupsd(8)
   Main PID: 855 (cupsd)
     Status: "Scheduler is running..."
      Tasks: 10 (limit: 18807)
     Memory: 65.5M
        CPU: 22.756s
     CGroup: /system.slice/cups.service
             ├─ 855 /usr/sbin/cupsd -l
             ├─ 901 RICOH-Aficio-SP-3510DN 54 bram cv_stolk.pdf 1 "HQwtrmrkShading=Shading20 Resolution=600dpi PageSize=Letter HQwtrmr>
             ├─ 902 ipp://10.0.1.3 54 bram cv_stolk.pdf 1 "HQwtrmrkShading=Shading20 Resolution=600dpi PageSize=Letter HQwtrmrkFontNam>
             ├─ 992 RICOH-Aficio-SP-3510DN 54 bram cv_stolk.pdf 1 "HQwtrmrkShading=Shading20 Resolution=600dpi PageSize=Letter HQwtrmr>
             ├─ 993 RICOH-Aficio-SP-3510DN 54 bram cv_stolk.pdf 1 "HQwtrmrkShading=Shading20 Resolution=600dpi PageSize=Letter HQwtrmr>
             ├─ 994 /bin/sh -e -c cat
             ├─ 995 cat
             ├─1831 /usr/lib/cups/notifier/dbus dbus:// ""
             ├─1832 /usr/lib/cups/notifier/dbus dbus:// ""
             └─2027 /usr/lib/cups/notifier/dbus dbus:// ""

May 31 11:04:55 deca systemd[1]: Starting CUPS Scheduler...
May 31 11:04:55 deca systemd[1]: Started CUPS Scheduler.
May 31 11:09:31 deca hpfax[2807]: [2807]: error: Failed to create /var/spool/cups/tmp/.hplip

OS: Ubuntu22.04LTS

内核： Linux 5.15.0-33-泛型

打印机：理光Aficio SP 3510DN

Answer 1

自动检测到的打印机有一个带有.local的地址，将(不再)工作。

ipp://3510DN-75A879.local:631/ipp/port1

当我添加打印机并显式设置IP地址时，我将再次获得一个工作打印机。

这一次，URI是：

socket://10.0.1.3:9100

通过IP找到的打印机被称为"HP JetDirect“，不管这意味着什么。我的打印机不是惠普，而是理光。

Ubuntu中的打印机只是让人困惑。