package zabbix-server-mysql 1:1.8.3-2ubuntu1 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 1

Ubuntu offered to report a bug while trying to uninstall software. Maybe zabbix-server-mysq was not installed at all. If so, I would not expect a crash / bug / problem

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: zabbix-server-mysql 1:1.8.3-2ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
Architecture: amd64
Date: Mon May 23 12:06:16 2011
ErrorMessage: subprocess installed pre-removal script returned error exit status 1
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110413)
SourcePackage: zabbix
Title: package zabbix-server-mysql 1:1.8.3-2ubuntu1 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)