snmpd fails to upgrade on do-release-upgrade -d from oneiric to precise

During do-release-upgrade -d, I got the message that snmpd failed to upgrade correctly. Scrolling back through the log, the deluser of the snmp user failed, apprarently because the process was running. (I also run agents under AgentX, including lldp and the published hrswinstalled.pl to allow me to snmp query installed packages). On another machine, when I stopped snmp before do-release-upgrade -d the upgrade completed without issues.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: snmpd 5.4.3~dfsg-2.4ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
ApportVersion: 2.0.1-0ubuntu4
Architecture: amd64
Date: Tue Apr 17 20:23:23 2012
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110426)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/usr/bin/zsh
SNMPVersion:
 NET-SNMP version: 5.4.3
 Web: http://www.net-snmp.org/
 Email: <email address hidden>
SourcePackage: net-snmp
SyslogSnmptrapd:

UpgradeStatus: Upgraded to precise on 2012-04-15 (2 days ago)
modified.conffile..etc.snmp.snmpd.conf: [modified]
mtime.conffile..etc.snmp.snmpd.conf: 2011-08-01T00:24:07.413724