[Bug 329647] Re: package postfix None [modified: /var/lib/dpkg/info/postfix.list] failed to install/upgrade: subprocess pre-installation script returned error exit status 1

[Andreas Olsson]

Seems as if there could have been some other apt process, perhaps an
automatic upgrade, going on in the background. That would have blocked
your current apt-get install and produced the exact same error.

What happens if you make another attempt to install postfix?

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

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package postfix None [modified: /var/lib/dpkg/info/postfix.list] failed to install/upgrade: subprocess pre-installation script returned error exit status 1
https://bugs.launchpad.net/bugs/329647
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