Public bug reported:

In Kubuntu 16.04 the scanners were detected by Xsane or other scan
programs as soon as it were plugged in. Also, if you unplugged it then
plugged in again also Xsane detected it immediately.

But in Kubuntu 18.04 the scanner is not detected by Xsane if you plug in
once Kubuntu 18.04 already running. Only it's detected if you starts
session with the scanner already plugged in. And if you unplugg it then
plug it again it is not detected anymore and you must restart the
computer with the cable plugged into the USB, to be detected.

It happens the same thing with other scan programs like Skanlite or
Simple Scan.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: usbutils 1:007-4build1
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: KDE
Date: Wed May 16 10:25:29 2018
InstallationDate: Installed on 2018-05-07 (8 days ago)
InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: usbutils
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: usbutils (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug bionic

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  Scanner not detected if plugged once Kubuntu 18.04 is running

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