[Bug 340404] Re: package postfix 2.5.5-1 failed to install/upgrade: subprocess post-installation script returned error exit status 1

[Mathias Gug]

Correct. You need to purge a package to remove its configuration.

Removing a package will leave the configuration files around. If you
delete them by hand, the system doesn't know about it and will assume
they're still around when you try to reinstall the package.

** Changed in: postfix (Ubuntu)
       Status: New => Invalid

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package postfix 2.5.5-1 failed to install/upgrade: subprocess post-installation script returned error exit status 1
https://bugs.launchpad.net/bugs/340404
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