On Tue, 17 Mar 2020, Dick Steffens wrote:

I had a similar problem with my relatively new HP MFP M148dw. I don't
remember what I had to do to fix it, but I got the instructions from a web
search. Perhaps someone else had the same problem with the Canon.

Thanks, Dick. I forgot to mention in my original post that sane-find-scanner
returned:
found USB scanner (vendor=0x04a9 [Canon], product=0x1912 [LiDE 400]) at 
libusb:001:047
could not open USB device 0x1d6b/0x0002 at 001:001: Access denied (insufficient 
permissions)

I'm not sure how to modify the perms since USB ports are dynamically
assigned when the device is plugged in.

And, of course, scanimage -L finds no device, either.

Rich
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