package postgresql-common 129 failed to install/upgrade: private key file "server.key" has group or world access

[subodh]

while upgrading to ubuntu 12

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: postgresql-common 129
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic-pae 3.2.14
Uname: Linux 3.2.0-24-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu7
Architecture: i386
Date: Mon May 7 17:31:21 2012
ErrorMessage: ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
PackageArchitecture: all
SourcePackage: postgresql-common
Title: package postgresql-common 129 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to precise on 2012-05-06 (1 days ago)

[Martin Pitt (pitti)]

Setting up postgresql-common (129) ...
 * Starting PostgreSQL 9.0 database server  * The PostgreSQL server failed to start. Please check the log output:
2012-05-07 17:31:20 IST FATAL: private key file "server.key" has group or world access

Please fix the permissions of the certificate. Permissions should be this:

-rw-r----- 1 root ssl-cert 891 Jul 12 10:38 /etc/ssl/private/ssl-cert-snakeoil.key

with these commands:
  sudo chgrp ssl-cert /etc/ssl/private/ssl-cert-snakeoil.key
  sudo chmod 640 /etc/ssl/private/ssl-cert-snakeoil.key