There is a bug report about 'printer can't be removed' upstream on https://gitlab.gnome.org/GNOME/gnome-control-center/issues/187 , I'm going to comment with some of the debug details you added maybe it can help them to debug the issue
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/1810404 Title: printing options set in control center don't work Status in gnome-control-center package in Ubuntu: Incomplete Bug description: 1. Open settings. 2. Go to Devices / Printers. 3. Click "Add..." and add a network printer with a duplex unit located automatically by the network scan. 4. Click the gear and elect "Printing Options". 5. Change the "Two-sided" option to enable two-sided printing. 6. Close the options dialog and settings window. 7. Print a document with multiple pages to that printer with "lp -d printer-name filename". 8. Observe how it prints single-sided. To get the setting to stick for real, I had to click on "Additional Printer Settings..." and change it there. ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: gnome-control-center 1:3.30.2-1ubuntu0.18.10.1 ProcVersionSignature: Ubuntu 4.18.0-13.14-generic 4.18.17 Uname: Linux 4.18.0-13-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.10-0ubuntu13.1 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Thu Jan 3 07:04:33 2019 InstallationDate: Installed on 2019-01-02 (0 days ago) InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3) SourcePackage: gnome-control-center UpgradeStatus: No upgrade log present (probably fresh install) modified.conffile..etc.apport.crashdb.conf: [modified] mtime.conffile..etc.apport.crashdb.conf: 2019-01-02T11:29:50.338663 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1810404/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
