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The dbus error when any paravirtualized Guest boots up
Although some Desktops and Display Managers may hide bootup messages, this error currently is thrown for all virtualized guests including KVM, QEMU, Xen, VMware, Virtualbox and likely more.
Running the following script in the Guest addresses this issue on all known distros (yes, other than openSUSE) and versions.
cat >> /etc/modprobe.d/50-blacklist.conf <<EOF # Blacklist smb device in virtual machines blacklist i2c_piix4 EOF