Description of problem:
Yesterday, I tried to upgrade to Fedora 30 on my Lenovo T480s with up-to-date Fedora 29, however, fwupd-offline-update.service failure caused that systemd stopped all other services including the dnf-system-upgrade.

Version-Release number of selected component (if applicable):
fwupd-1.2.5-1.fc29.x86_64
dnf-4.1.0-1.fc29.noarch
python3-dnf-plugin-system-upgrade-4.0.2-1.fc29.noarch

How reproducible:
I tried the system-upgrade three times and it failed the same way in both cases, so it seems that it is always reproducible in my case...

Steps to Reproduce:
1. sudo dnf upgrade --refresh
2. sudo dnf system-upgrade download --releasever=30 --allowerasing
3. sudo dnf system-upgrade reboot

Actual results:
Mar 05 19:56:17 t480s dbus-daemon[1078]: [system] Failed to activate service 'org.freedesktop.fwupd': timed out (service_start_timeout=25000ms)
Mar 05 19:56:17 t480s fwupdmgr[1072]: Failed to connect to daemon: Error calling StartServiceByName for org.freedesktop.fwupd: GDBus.Error:org.freedesktop.DBus.Error.TimedO>
Mar 05 19:56:17 t480s systemd[1]: fwupd-offline-update.service: Main process exited, code=exited, status=1/FAILURE
Mar 05 19:56:17 t480s systemd[1]: fwupd-offline-update.service: Failed with result 'exit-code'.
Mar 05 19:56:17 t480s systemd[1]: fwupd-offline-update.service: Triggering OnFailure= dependencies.
...
Mar 05 19:56:17 t480s systemd[1]: dnf-system-upgrade.service: Main process exited, code=killed, status=15/TERM
Mar 05 19:56:17 t480s systemd[1]: dnf-system-upgrade.service: Failed with result 'signal'.
Mar 05 19:56:17 t480s systemd[1]: Stopped System Upgrade using DNF.
Mar 05 19:56:17 t480s systemd[1]: dnf-system-upgrade.service: Triggering OnFailure= dependencies.

Expected results:
fwupd-offline-update.service should not fail and dnf-system-upgrade.service should upgrade the system.

Additional info:
Is there any additional info I can provide before I will try to remove fwupd as a workaround?