> However, the content is perplexing. I do not have Python or coding
> skills but, looking at HPLIP's os_utils.py, I find
Sorry, you are right, I thought I hadn't installed hplip but it is installed due to a dependency.
The hpfax/hplip error appears when plugging in a USB printer:
Jan 27 11:49:15 debian kernel: usb 3-1.4: new full-speed USB device number 12 using xhci_hcd
Jan 27 11:49:18 debian kernel: usb 3-1.4: new high-speed USB device number 13 using xhci_hcd
Jan 27 11:49:18 debian kernel: usb 3-1.4: New USB device found, idVendor=04a9, idProduct=26da, bcdDevice= 1.00
Jan 27 11:49:18 debian kernel: usb 3-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Jan 27 11:49:18 debian kernel: usb 3-1.4: Product: Canon CAPT USB Device
Jan 27 11:49:18 debian kernel: usb 3-1.4: Manufacturer: Canon
Jan 27 11:49:18 debian kernel: usb 3-1.4: SerialNumber: 0000B296NEYm
Jan 27 11:49:18 debian kernel: usblp 3-1.4:1.0: usblp0: USB Bidirectional printer dev 13 if 0 alt 0 proto 2 vid 0x04A9 pid 0x26DA
Jan 27 11:49:18 debian systemd[1]: Started Configure Plugged-In Printer.
Jan 27 11:49:18 debian udev-configure-printer[10637]: add usb-003-013
Jan 27 11:49:19 debian udev-configure-printer[10637]: device devpath is /devices/pci0000:00/0000:00:14.0/usb3/3-1/3-1.4
Jan 27 11:49:19 debian udev-configure-printer[10637]: MFG:Canon MDL:LBP3010/LBP3018/LBP3050 SERN:- serial:0000B296NEYm
Jan 27 11:49:24 debian hpfax[10666]: [10666]: error: Failed to create /var/spool/cups/tmp/.hplip
Jan 27 11:49:24 debian udev-configure-printer[10637]: no corresponding CUPS device found
Jan 27 11:49:24 debian systemd[1]: configure-printer@usb-003-013.service: Succeeded.