package postfix 2.7.0-1 failed to install status 75 setgid_group Local only

[Jacob Anawalt]

Binary package hint: postfix

The error message looks very similar to the one in bug 378955 marked fixed over a year ago.

Running newaliases
newaliases: fatal: file /etc/postfix/main.cf: parameter setgid_group: group postdrop has same group ID as timidity
dpkg: error processing postfix (--configure):
 subprocess installed post-installation script returned error exit status 75

I am not using "no configuration" as noted in comment 7 of that bug. Instead I was trying to configure "Local only".

ProblemType: Package
DistroRelease: Ubuntu 10.04
Package: postfix 2.7.0-1
ProcVersionSignature: Ubuntu 2.6.32-24.38-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Mon Aug 2 19:02:02 2010
ErrorMessage: subprocess installed post-installation script returned error exit status 75
SourcePackage: postfix
Title: package postfix 2.7.0-1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 75