Public bug reported:

I recently update my Kubuntu from 20.04 to

Description:    Ubuntu 20.10
Release:        20.10

After the upgrade, it is no longer possible to scan documents using CanoScan 
N1240U.
lsusb and sane-find-scanner detected the scanner while scanimage, skanlite and 
xsane cannot found it.
I checked permission, I ran these tools as root, I configured plustek.conf 
manually but nothing worked.

Finally I rollback libsane, libsane1 and libsane-common from 1.0.31-2 to
1.0.29-0ubuntu5.2 and the scanner is detected out-of-the-box.

** Affects: sane-backends (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1901381

Title:
  libsane regression error in Ubuntu 20.10: scanner not found

Status in sane-backends package in Ubuntu:
  New

Bug description:
  I recently update my Kubuntu from 20.04 to

  Description:    Ubuntu 20.10
  Release:        20.10

  After the upgrade, it is no longer possible to scan documents using CanoScan 
N1240U.
  lsusb and sane-find-scanner detected the scanner while scanimage, skanlite 
and xsane cannot found it.
  I checked permission, I ran these tools as root, I configured plustek.conf 
manually but nothing worked.

  Finally I rollback libsane, libsane1 and libsane-common from 1.0.31-2
  to 1.0.29-0ubuntu5.2 and the scanner is detected out-of-the-box.

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