I'm very sorry, but I was only lucky for about 10 correct clean scans after my
above described reinstalling. Then the black line reappeared immediately after
scan before the correction by the software (repositioning). So the result was
always ok. But then I got two errors:
1) Warning running
Since ubuntu 17.10 I had always to switch to Windows 10 for using my Canon LIDE
100 because of the vertical central black line.
Before deciding to change finally my scanner, i looked again to this page and
saw the remark of genti in date of 2018-03-07.
Under ubuntu 18.10 I realized the following
Since the update to ubuntu 17.10 the black vertical central line appears
on my PC and Laptop with any scanning software independently of the
configurations. The scanner works very well under Windows 10. I'm still
waiting for a solution!
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