Mailscanner Installation Problem after upgrade to Sarge

[Fabian Hugelshofer <hugelshofer2003@gmx.ch>]

Hello

I'm having problems upgrading Mailscanner from Woody to Sarge. I did a
dist-upgrade for my system which broke (because of Mailscanner) without
upgrading all packages. Further i removed Mailscanner to complete
dist-upgrade. Mailscanner can't still be installed.

The Output is:

# aptitude -f install mailscanner
Reading Package Lists... Done
Building Dependency Tree
Reading extended state information
Initializing package states... Done
Reading task descriptions... Done
The following NEW packages will be installed:
  mailscanner
0 packages upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B/1936kB of archives. After unpacking 5837kB will be used.
Writing extended state information... Done
Preconfiguring packages ...
(Reading database ... 24043 files and directories currently installed.)
Unpacking mailscanner (from .../mailscanner_4.41.3-2_all.deb) ...
/var/lib/dpkg/tmp.ci/preinst: line 22: db_get: command not found
dpkg: error processing
/var/cache/apt/archives/mailscanner_4.41.3-2_all.deb (--unpack):
 subprocess pre-installation script returned error exit status 127
Errors were encountered while processing:
 /var/cache/apt/archives/mailscanner_4.41.3-2_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
Ack!  Something bad happened while installing packages.  Trying to recover:
Reading Package Lists... Done
Building Dependency Tree
Reading extended state information
Initializing package states... Done
Reading task descriptions... Done

I don't know where to get db_get. It isn't on the System (#db_get
returns "command not found") and i could not lokate a package with
#apt-file search db_get.
Asking Google didn't bring any helpful information eighter.

I'm not sure if it is a bug or just a problem on my system.

Tanks for help

Fabian