I also had the same problems (and same solution) with a Dell laptop
Latitude E6430s, with the same system (fresh install, as upgrade from
16.04 did not work).
lsb_release -rd:
Description: Ubuntu 18.04.1 LTS
Release: 18.04
apt-cache policy system-config-printer:
system-config-printer:
Installé : 1.5.11-1ubuntu2
Candidat : 1.5.11-1ubuntu2
Table de version :
*** 1.5.11-1ubuntu2 500
500 http://fr.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
500 http://fr.archive.ubuntu.com/ubuntu bionic/main i386 Packages
100 /var/lib/dpkg/status
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https://bugs.launchpad.net/bugs/1795150
Title:
Canon PIXMA MG4250 unhandled by system-config-printer
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