Cannot enable printer in Printers pane

[panicsteve]

Prerequisites

• I have searched open and closed issues for duplicates.

Describe the bug

Enabling a printer by toggling its switch to the "on" position does not seem to make the printer functional. Additionally, after relaunching System Settings, the toggle has moved itself back to the "off" position.

To Reproduce

Steps to reproduce the behavior:

1. Launch System Settings.

I see all 3 printers on my LAN here, as expected. All are marked "Disabled".

2. Click on the printer I want to enable
3. Click on the large toggle button in the upper right of the pane to set it to the "on" position

At this point, the word "Disabled" still appears below the printer in the list of printers.

4. Quit System Settings via the window close widget
5. Launch System Settings again

Printer is still marked "Disabled"

6. Select the same printer again

Toggle switch has reset itself to "off" position.

Expected behavior

• Printer reads "enabled" after being toggled on
• Printer is usable from applications which can print
• Printer toggle switch does not revert to "off" position on subsequence launches of System Settings

Screenshots or screen recordings

Will provide if desired.

Logs

Happy to provide, but I'm new to the OS and not sure which logs are relevant or where they're located. Let me know!

Platform Information

elementary OS 5.0 Juno
Built on Ubuntu 18.04.2 LTS
Linux 4.15.0-66-generic
GTK 3.22.30

Dual-core Intel i7-6560U @ 2.250 GHz
Iris Graphics 540
8 GB Memory
981.1 GB Storage

• I'm using the latest version from git that I've manually compiled
• I'm using the latest released stable version

Additional context

Printer in question is HP LaserJet M402dw.

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[gre0j]

Might be related to #90

[Letterus]

Still valid using 6 Odin.

[rdanter]

Still valid on 6.1 Jólnir.

I also saw that by default my user is not part og the lpadmin group, so I was also unable to control printers via the CUPS web interface. Adding myself to the group and logging out and in again let me at least control the printer via CUPS and I can print, but it would be nice if the Printers tool in settings worked too.

[rdanter]

Perhaps because of this issue, I don't ever see any printer indicator in the systray. Should there be one? Mint, for example, shows an icon and allows you to control the printer from there. Other systems at least show an icon when there are active print jobs. Would be nice to have this but I don't want to open a feature request in case it already exists and is just not appearing because of this issue.

[jeremypw]

There is a PR to fix #90 (PR #168) to be submitted for review soon. Not sure that it will fix this particular case as the printer remains disabled even after restarting System Settings. In the other issue, the printer was in fact enabled - it just was not shown as such in the plug until System Settings was restarted.

@rdanter There is no systray in the Windows sense. Maybe an indicator in the wingpanel to show info on the print queue would be a good idea however - there is no "wingpanel-indicator-printers" at the moment. Priority is to get the settings plug working! If you are able to test the PRs I have submitted to see whether it fixes your problem please do.