package postfix 3.4.13-0ubuntu1 failed to install/upgrade: installed postfix package post-installation script subprocess returned error exit status 75

[Orvar Korvar]

See the summary

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: postfix 3.4.13-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-45.49-generic 5.4.55
Uname: Linux 5.4.0-45-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
CasperMD5CheckResult: skip
Date: Thu Sep 10 16:05:46 2020
ErrorMessage: installed postfix package post-installation script subprocess returned error exit status 75
EtcMailname: Ubuntu-20.04
Hostname: Ubuntu-20.04
InstallationDate: Installed on 2020-06-21 (80 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
PostconfMydomain: 04
PostconfMyhostname: Ubuntu-20.04
PostconfMyorigin: /etc/mailname
Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.18rc1, python-is-python2, 2.7.17-4
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.2ubuntu0.1
SourcePackage: postfix
Title: package postfix 3.4.13-0ubuntu1 failed to install/upgrade: installed postfix package post-installation script subprocess returned error exit status 75
UpgradeStatus: No upgrade log present (probably fresh install)

[Simon Déziel (sdeziel)]

Hi Orvar,

The problem seems to be due to a local configuration error where the parameter "mydomain" is not valid:

newaliases: warning: valid_hostname: numeric hostname: 04
newaliases: fatal: file /etc/postfix/main.cf: parameter mydomain: bad parameter value: 04
dpkg: error processing package postfix (--configure):
 installed postfix package post-installation script subprocess returned error exit status 75

Since it's a local problem, I'll mark it as invalid. Thanks

[Orvar Korvar (cannibalcorpse)]

Hi, thanx for your answer. However, I am a Linux newbie, and have not tinkered with my system. It is basically a fresh 20.04 and I have applied all updates. I have definitely not done anything with "mydomain". So why is that I get this error, do you know? How can I resolve this problem? Should I set the "mydomain" thing to something? Why is it that a fresh Ubuntu 20.04 with all updates triggers this error?

Right now, my Nvidia driver has reverted back to Noveau driver, because the latest update could not update the Nvidia driver - I suspect the update error is because of this "mydomain" problem? So now I am stuck at 800x600 resolution which is unusable. I can not work.

I remember earlier when I used 18.04 LTS, I also got problems like this. After a update the resolution was stuck to 640x480. I tried to fix it by installing Nvidia driver, but no luck. At the end I bricked my Ubuntu install, when I tried to download the Nvidia driver and install it manually. So I had to revert back to Unix. Now I am trying to transition to Ubuntu, but I get this problem. I am stuck at 800x600 with Noveau and cannot install Nivida driver to fix the resolution. I dont understand why the updates cause these problems? Should I set the "mydomain" to something? Do you have any clue where I can start to dig?

[Orvar Korvar (cannibalcorpse)]

mydomain is not set at all. Who is using this parameter, what is it, and why is not the parameter set, on a fresh Ubuntu with all updates?

$ echo $mydomain

$

[Orvar Korvar (cannibalcorpse)]

Also, the $mydomain is not set in main.cf in postfix. I do not understand why Ubuntu update is using postfix? Here is my main.cf (which I have not tinkered with).

$ less /etc/postfix/main.cf
# See /usr/share/postfix/main.cf.dist for a commented, more complete version

# Debian specific: Specifying a file name will cause the first
# line of that file to be used as the name. The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = no

# See http://www.postfix.org/COMPATIBILITY_README.html -- default to 2 on
# fresh installs.
compatibility_level = 2

# TLS parameters
smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
smtpd_tls_security_level=may

smtp_tls_CApath=/etc/ssl/certs
smtp_tls_security_level=may
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = Ubuntu-20.04
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = $myhostname, Ubuntu-20.04, localhost.04, , localhost
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = all

[Orvar Korvar (cannibalcorpse)]

and $myhostname is empty as well.
$ echo $myhostname

$

[Orvar Korvar (cannibalcorpse)]

Ok, now Nvidia driver works, I have a working desktop. I just rebooted. I have no idea what is happening nor why. As a Unix (Solaris) user I am transitioning to Ubuntu, but I think that Ubuntu is a bit fragile.

But, is it a problem that myshostname and mydomain are not set? Should it be fixed?

[Paride Legovini (paride)]

Hello Orvar,

You can find pointers to get help for this sort of problem in the Community Support channels:

https://ubuntu.com/support/community-support

We use this bug tracker to track bugs in Ubuntu, rather than configuration problems. This helps us to focus on fixing bugs in Ubuntu.

If you believe you actually found a bug, then you may find it helpful to read "How to report bugs effectively" http://www.chiark.greenend.org.uk/~sgtatham/bugs.html. We'd be grateful if you would then provide a more complete description of the problem and explain why you believe this is a bug in Ubuntu rather than a problem specific to your system.

[Orvar Korvar (cannibalcorpse)]

Hello Paride,

This is very annoying. I cannot update Ubuntu. The updates all fail. I have not tinkered with Ubuntu, or changed anything. It is a stock Ubuntu. Now Retropie have stopped working as well, after the last update. Ubuntu is very fragile it seems? I install something, and it works fine. Then I do an update and hell breaks loose.

I do not understand where to even begin to look. The symptoms are that updates can not be installed. The GUI says something like "failed update" or something similar. So I tried to update again from command line to catch the output.
$ sudo apt update
works fine

But this upgrade command causes problems. How can I run some commands giving output, to give you information for debugging?

$ sudo apt upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
  glib-networking:i386 gstreamer1.0-x:i386 libaa1:i386 libavc1394-0:i386 libcaca0:i386 libdv4:i386 libfprint-2-tod1 libgstreamer-plugins-good1.0-0:i386
  libgudev-1.0-0:i386 libiec61883-0:i386 libllvm9 libllvm9:i386 libnvidia-common-418-server libnvidia-common-435 libnvidia-common-440
  libnvidia-common-440-server libnvidia-common-450-server libproxy1v5:i386 libraw1394-11:i386 libsamplerate0:i386 libshout3:i386 libslang2:i386
  libsoup2.4-1:i386 libtag1v5:i386 libtag1v5-vanilla:i386 libxv1:i386 linux-headers-5.4.0-48 linux-headers-5.4.0-48-generic linux-image-5.4.0-48-generic
  linux-modules-5.4.0-48-generic linux-modules-extra-5.4.0-48-generic
Use 'sudo apt autoremove' to remove them.
The following packages will be upgraded:
  firefox firefox-locale-en libcryptsetup12 libnetplan0 libnvidia-common-450-server netplan.io python3-distupgrade ubuntu-release-upgrader-core
  ubuntu-release-upgrader-gtk
9 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
2 not fully installed or removed.
Need to get 57,0 MB/57,0 MB of archives.
After this operation, 686 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://se.archive.ubuntu.com/ubuntu focal-updates/main amd64 libcryptsetup12 amd64 2:2.2.2-3ubuntu2.3 [183 kB]
Get:2 http://se.archive.ubuntu.com/ubuntu focal-updates/main amd64 libnetplan0 amd64 0.100-0ubuntu4~20.04.2 [28,9 kB]
Get:3 http://se.archive.ubuntu.com/ubuntu focal-updates/main amd64 netplan.io amd64 0.100-0ubuntu4~20.04.2 [83,4 kB]
Get:4 http://se.archive.ubuntu.com/ubuntu focal-updates/main amd64 ubuntu-release-upgrader-gtk all 1:20.04.28 [9 364 B]
Get:5 http://se.archive.ubuntu.com/ubuntu focal-updates/main amd64 ubuntu-release-upgrader-core all 1:20.04.28 [23,7 kB]
Get:6 http://se.archive.ubuntu.com/ubuntu focal-updates/main amd64 python3-distupgrade all 1:20.04.28 [104 kB]
Get:8 http://se.archive.ubuntu.com/ubuntu focal-updates/main amd64 firefox-locale-en amd64 82.0+build2-0ubuntu0.20.04.1 [659 kB]
Get:7 http://saimei.ftp.acc.umu.se/ubuntu focal-updates/main amd64 firefox amd64 82.0+build2-0ubuntu0.20.04.1 [55,9 MB]
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