Hi, Well, hopefully LTS can fix this for those of us that are using oldstable (stretch). It almost seems like someone broke production on the oldstable version, then said, "don't worry - we've fixed it on unstable" (a version no one is using in production), then walked away :)
Current work around is to either apt-mark snmpd before you upgrade if you haven't already broken it OR to run something like apt install snmpd=5.7.3+dfsg-1.7+deb9u1 libsnmp30=5.7.3+dfsg-1.7+deb9u1 to force the downgrade. Kind regards James Greig
