Public bug reported:
I have seen this several times on updating
ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: postfix 2.9.1-4
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu7
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https://bugs.launchpad.net/bugs/1006196
Title:
package postfix 2.9.1-4 failed to install/upgrade: subprocess
installed post-installation script returned error exit