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 steps without a new start:
1) uninstall by synaptic: sane, xsane, xsane-common
2) reinstall by synaptic: sane, xsane, xsane-common
Now my LIDE 100 is working fine using gscan2pdf without black line as the years before 17.04!
I don't know which of the three reinstalled applications resolved the problem.
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 steps without a new start:
1) uninstall by synaptic: sane, xsane, xsane-common
2) reinstall by synaptic: sane, xsane, xsane-common
Now my LIDE 100 is working fine using gscan2pdf without black line as the years before 17.04!
I don't know which of the three reinstalled applications resolved the problem.