Comment # 4 on bug 1179942 from Andrei Borzenkov

(In reply to Andrei Borzenkov from comment #3)
> 
> And when I booted this VM today it started performing offline update. I
> attach system log in case someone can spot something useful there.

Comparing system and user logs.

g-s log (time is likely in UTC)

05:33:52:0937 PK  role now update-packages
05:33:52:0941 Gs  emitting global waiting
05:33:53:0405 Gs  emitting global querying
05:33:53:0852 Gs  emitting global installing
05:33:54:0132 Gs  emitting global downloading

system log

led from uid 1000
Dec 16 08:33:54 tw.0.2.15 packagekitd[1714]:
DownloadProgressReportReceiver::start():http://download.opensuse.org/tumbleweed/repo/oss/
--kernel-macros;5.9.14-1.2;noarch;openSUSE-20170729-0

g-s log

05:34:04:0493 Gs  emitting global finished
05:34:04:0501 Gs  not GsPlugin error pk-engine-error-quark:1:
GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._pk_2dengine_2derror_2dquark.Code1:
Prepared update not found: /var/lib/PackageKit/prepared-update

While PackageKit continues

Dec 16 08:33:55 tw.0.2.15 packagekitd[1714]:
DownloadProgressReportReceiver::start():http://download.opensuse.org/tumbleweed/repo/oss/
--libgstreamer-1_0-0;1.18.2-1.1;x86_64;openSUSE-20170729-0
Dec 16 08:33:55 tw.0.2.15 packagekitd[1714]:
DownloadProgressReportReceiver::start():http://download.opensuse.org/tumbleweed/repo/oss/
--libldap-2_4-2-32bit;2.4.56-63.1;x86_64;openSUSE-20170729-0
...
Dec 16 08:35:24 tw.0.2.15 PackageKit[1714]: update-packages transaction
/16_aebbddec from uid 1000 finished with success after 91423ms
Dec 16 08:35:42 tw.0.2.15 PackageKit[1714]: daemon quit
Dec 16 08:35:42 tw.0.2.15 systemd[1]: packagekit.service: Succeeded.
Dec 16 08:35:42 tw.0.2.15 systemd[1]: packagekit.service: Consumed 45.318s CPU
time.

So apparently GNOME Software somehow does not understand that PackageKit needs
to download packages and and prepare (offline) update and does not wait for it
to finish.