I installed sane-backends - 1.0.25-git20150121-precise0 and upgraded
libsane, sane-utils and libsane-common but this didn't fix the issue for
me.

scanimage -L

now appears to consistently identify the scanner:

device `plustek:libusb:001:019' is a Hewlett-Packard Scanjet 2100c
flatbed scanner

but issuing a scanimage command just bails out after a few seconds:

 scanimage -vvv -format pnm >outfile.pnm
Calling sane_exit
scanimage: finished

there is no activity from the scanner.

When I first raised the bug I'd been playing around with various sources
from sane & libusb so it's possible something isn't quite linking
together but I'm pretty sure I've removed all those remnants from the
/usr/local area and everything now appears to be linking to the
"correct" (ie. in the /usr/lib/x86...) area.

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https://bugs.launchpad.net/bugs/1250196

Title:
  sane plustek backend not working on USB 3 root hub

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