Created attachment 1410911 [details]
g-s verbose log

Description of problem:

I keep receiving a GNOME Shell notification that there are OS Updates, I click view, and g-s is launched and shows a single line OS Updates. When I click on that line, there are no updates listed. When I click on the Update button nothing happens. When I click on the Update All button, nothing happens. When I rm -rf /var/cache/PackageKit/27/* and reboot, soon after I get another update notification and the same experience as described.


Version-Release number of selected component (if applicable):
gnome-software-3.28.0-4.fc27.x86_64

How reproducible:
Always


Steps to Reproduce:
1. Click on Update button to the right of the OS Updates line
2.
3.

Actual results:


Expected results:


Additional info:

Verbose log records only this when clicking on either Update or Update All

23:39:04:0631 As  run 0x55f92821af70~GsPlugin::*(gs_plugin_update)
23:39:04:0633 As  run 0x55f92821af70~GsPlugin::fwupd(gs_plugin_update_app){org.gnome.Software.OsUpdate}
23:39:04:0634 As  run 0x55f92821af70~GsPlugin::systemd-updates(gs_plugin_update_app){org.gnome.Software.OsUpdate}
23:39:04:0634 As  run 0x55f92821af70~GsPlugin::flatpak(gs_plugin_update_app){org.gnome.Software.OsUpdate}
23:39:04:0634 Gs  no refine flags set for transaction
23:39:04:0635 Gs  found new org.gnome.Software.OsUpdate
23:39:04:0635 Gs  running update with failure-flags=use-events with timeout=60 on apps */*/*/os-update/org.gnome.Software.OsUpdate/* took 4ms
23:39:09:0639 Gs  plugin no longer recently active: fwupd
23:39:09:0639 Gs  plugin no longer recently active: systemd-updates
23:39:09:0639 Gs  plugin no longer recently active: flatpak
23:39:38:0159 Gs  First hourly updates check
23:39:38:0159 Gs  Getting upgrades
23:39:38:0160 As  run 0x55f9290d2450~GsPlugin::*(gs_plugin_add_distro_upgrades)
23:39:38:0160 As  run 0x55f9290d2450~GsPlugin::appstream(gs_plugin_add_distro_upgrades)
23:39:38:0160 As  run 0x55f9290d2450~GsPlugin::fedora-pkgdb-collections(gs_plugin_add_distro_upgrades)
23:39:38:0161 Gs  running get-distro-updates with refine-flags=require-setup-action with timeout=60 on plugin=fedora-pkgdb-collections took 1ms
23:39:38:0161 Gs  no upgrades; withdrawing upgrades-available notification
23:39:43:0166 Gs  plugin no longer recently active: appstream
23:39:43:0166 Gs  plugin no longer recently active: fedora-pkgdb-collections