Waited for dpkg assert-multi-arch but it wasn't there

[pjmlmas]

I was attempting to use synaptic to install duplicity...

Error message:
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
W: Waited for dpkg --assert-multi-arch but it wasn't there - dpkgGo (10: No child processes)

Solution I found some other blog...
sudo mv /var/lib/dpkg/info/install-info.postinst /var/lib/dpkg/info/install-info.postinst.bad

duplicity seemed to be installed.

[pjmlmas]

I have not tried this solution. I read conflicting solutions.
Is it dpkg script, xubuntu, synaptic or libc package that has issue.