Public bug reported:

Hello

while running upgrade of ubuntu 16.04.7 LTS to 18.04.6 the following
error occured:

*************
Found initrd image: /boot/initrd.img-4.4.0-210-generic
Found linux image: /boot/vmlinuz-4.4.0-116-generic
Found initrd image: /boot/initrd.img-4.4.0-116-generic
done
Processing triggers for sgml-base (1.29) ...
Processing triggers for resolvconf (1.79ubuntu10.18.04.3) ...
Errors were encountered while processing:
 sane-utils
Exception during pm.DoInstall():  E:Sub-process /usr/bin/dpkg returned an error 
code (1)

Could not install the upgrades

The upgrade has aborted. Your system could be in an unusable state. A
recovery will run now (dpkg --configure -a).

Please report this bug in a browser at
http://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+filebug
and attach the files in /var/log/dist-upgrade/ to the bug report.
E:Sub-process /usr/bin/dpkg returned an error code (1)

Setting up sane-utils (1.0.27-1~experimental3ubuntu2.4) ...
gpasswd: group 'scanner' does not exist in /etc/group
adduser: `/usr/bin/gpasswd -a saned scanner' returned error code 3. Exiting.
dpkg: error processing package sane-utils (--configure):
 installed sane-utils package post-installation script subprocess returned 
error exit status 1
Errors were encountered while processing:
 sane-utils
***************


***************
> lsb_release -rd
Description:    Ubuntu 18.04.6 LTS
Release:        18.04

> apt-cache policy sane-utils
sane-utils:
  Installed: 1.0.27-1~experimental3ubuntu2.4
  Candidate: 1.0.27-1~experimental3ubuntu2.4
  Version table:
 *** 1.0.27-1~experimental3ubuntu2.4 500
        500 http://uk.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
Packages
        100 /var/lib/dpkg/status
     1.0.27-1~experimental3ubuntu2.3 500
        500 http://uk.archive.ubuntu.com/ubuntu bionic-security/main amd64 
Packages
     1.0.27-1~experimental3ubuntu2 500
        500 http://uk.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

>  grep -r scanner /etc/group*
There is indeed no group scanner in /etc/group

****************
What you expected to happen

I would expect the upgrader to propose a choice i.e. continue and ignore
sane-utils installation rather that just stopping the upgrade process.

****************
What happened instead

upgrader stopped and how to check installation status ? Should I restart
? unknown state.

I am not quite sure why sane-utils

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "files in /var/log/dist-upgrade/"
   
https://bugs.launchpad.net/bugs/1949976/+attachment/5538425/+files/dist_upgrade.tag.gz

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https://bugs.launchpad.net/bugs/1949976

Title:
  sane-utils error while upgrading from 16.04.7 LTS to 18.04.6 LTS

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