Public bug reported:
This has happened several times during routine Update Manager sessions.
As far as I know I am not even using Postfix!
ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: postfix 2.9.3-2~12.04.1
ProcVersionSignature: Ubuntu 3.2.0-27.43-generic 3.2.21
Uname: Linux
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https://bugs.launchpad.net/bugs/1031795
Title:
package postfix 2.9.3-2~12.04.1 failed to install/upgrade: subprocess
installed post-installation script returned