I have confirmed that this a user issue rather than a bug. I was able to
get the scanner to work if you properly perform the procedure and remove
the white background piece. It unlatches and can be removed.
** Changed in: sane-backends (Ubuntu)
Status: Confirmed => Invalid
** Converted to
The use of the transparency unit in Canon 9000F Mark II requires to take
the regular white background away from the covering lid, beneath with
the actual backlight of the transparency unit resides.
Any scanning attempt with the transparency unit as source while the
backlight is hidden by the
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: sane-backends (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1744775