Public bug reported:
Problem occurred during do-release-upgrade -d on a v24 Ubuntu system.
ProblemType: Package
DistroRelease: Ubuntu 26.04
Package: postfix 3.10.6-4ubuntu2.1
ProcVersionSignature: Ubuntu 6.8.0-124.124-generic 6.8.12
Uname: Linux 6.8.0-124-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CloudArchitecture: x86_64
CloudID: none
CloudName: none
CloudPlatform: none
CloudSubPlatform: config
Date: Sat Jun 6 10:01:47 2026
DuplicateSignature: InvalidHostOrDomain
ErrorMessage: old postfix package postinst maintainer script subprocess failed
with exit status 1
EtcMailname: *** /etc/mailname does not exist ***
Hostname: puppy
InstallationDate: Installed on 2023-03-02 (1192 days ago)
InstallationMedia:
PostconfMydomain: Error: command ['/usr/sbin/postconf', '-h', 'mydomain']
failed with exit code 1: /usr/sbin/postconf: fatal: open /etc/postfix/main.cf:
No such file or directory
PostconfMyhostname: Error: command ['/usr/sbin/postconf', '-h', 'myhostname']
failed with exit code 1: /usr/sbin/postconf: fatal: open /etc/postfix/main.cf:
No such file or directory
PostconfMyorigin: Error: command ['/usr/sbin/postconf', '-h', 'myorigin']
failed with exit code 1: /usr/sbin/postconf: fatal: open /etc/postfix/main.cf:
No such file or directory
Python3Details: /usr/bin/python3.14, Python 3.14.4, python3-minimal,
3.14.3-0ubuntu2
PythonDetails: N/A
RebootRequiredPkgs: Error: path contained symlinks.
RelatedPackageVersions:
dpkg 1.23.7ubuntu1
apt 3.2.0
SourcePackage: postfix
Title: package postfix 3.10.6-4ubuntu2.1 failed to install/upgrade: old postfix
package postinst maintainer script subprocess failed with exit status 1
UpgradeStatus: Upgraded to resolute on 2026-06-06 (0 days ago)
modified.conffile..etc.network.ip-down.d.postfix: [deleted]
modified.conffile..etc.postfix.post-install: [deleted]
modified.conffile..etc.postfix.postfix-script: [deleted]
** Affects: postfix (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-package need-duplicate-check resolute
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https://bugs.launchpad.net/bugs/2155776
Title:
package postfix 3.10.6-4ubuntu2.1 failed to install/upgrade: old
postfix package postinst maintainer script subprocess failed with exit
status 1
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