Sense, I think you can change an association, but not delete it.
According to the report on alioth, this looks like a problem in hplip.
Adding ubuntu hplip package.
** Changed in: debian
Importance: Undecided => Unknown
Bugwatch: None => alioth.debian.org/ #305010
Status: New => Unknown
** Changed in: debian
Importance: Unknown => Undecided
Bugwatch: alioth.debian.org/ #305010 => None
Status: Unknown => New
** Changed in: sane-backends
Importance: Undecided => Unknown
Bugwatch: None => alioth.debian.org/ #305010
Status: New => Unknown
** Also affects: hplip (Ubuntu)
Importance: Undecided
Status: New
** Changed in: sane-backends (Ubuntu)
Importance: Undecided => Low
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HP DeskJet F4140 All-in-One has wrong permissions on the USB scanner device
https://bugs.launchpad.net/bugs/134841
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