Ok, I can now reliably reproduce this.
If I install karmic, then install dovecot-postfix, then upgrade to
lucid, then maverick, and always choose the default option to keep the
conffile that is on the system, this occurs every time.
** Changed in: dovecot (Ubuntu Maverick)
Status: Confirmed => In Progress
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package mail-stack-delivery 1:1.2.12-1ubuntu7 failed to install/upgrade:
subprocess new pre-installation script returned error exit status 1
https://bugs.launchpad.net/bugs/653362
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