package apache2 2.4.41-4ubuntu3 failed to install/upgrade: ERROR: Conf phppgadmin does not exist!

[Ko Ko Zin]

Encounter the problem while upgrading from Ubuntu-18.04 LTS to Ubuntu-20.04 LTS.

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: apache2 2.4.41-4ubuntu3
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
Apache2ConfdDirListing: False
Apache2Modules:
 AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
 httpd (pid 1757) already running
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
Date: Fri Apr 24 18:47:49 2020
ErrorMessage: installed apache2 package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2016-06-03 (1420 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
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 2.0.2
SourcePackage: apache2
Title: package apache2 2.4.41-4ubuntu3 failed to install/upgrade: installed apache2 package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to focal on 2020-04-24 (0 days ago)

[Rafael David Tinoco (rafaeldtinoco)]

This is the error during upgrade:

Preparing to unpack .../840-phppgadmin_7.12.1+dfsg-1_all.deb ...
Unpacking phppgadmin (7.12.1+dfsg-1) over (5.1+ds-3) ...
...
Setting up phppgadmin (7.12.1+dfsg-1) ...
Installing new version of config file /etc/phppgadmin/config.inc.php ...
Package apache2 is not configured yet. Will defer actions by package phppgadmin.
...
info: Executing deferred 'a2enconf phppgadmin' for package phppgadmin
ERROR: Conf phppgadmin does not exist!
dpkg: error processing package apache2 (--configure):
 installed apache2 package post-installation script subprocess returned error exit status 1

The module wasn't able to be enabled after apache2 (and the module) was updated.

[Bryce Harrington (bryce)]

The log shows there was a configuration question for postfix, that caused apache2 to be left unconfigured:

Setting up postfixadmin (3.2.1-3) ...
Installing new version of config file /etc/apache2/conf-available/postfixadmin.conf ...

Configuration file '/etc/postfixadmin/config.inc.php'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ? Your options are:
    Y or I : install the package maintainer's version
    N or O : keep your currently-installed version
      D : show the differences between the versions
      Z : start a shell to examine the situation
 The default action is to keep your current version.
*** config.inc.php (Y/I/N/O/D/Z) [default=N] ?
Package apache2 is not configured yet. Will defer actions by package postfixadmin.
[...]

Setting up phppgadmin (7.12.1+dfsg-1) ...
Installing new version of config file /etc/phppgadmin/config.inc.php ...
Package apache2 is not configured yet. Will defer actions by package phppgadmin.
[...]

Setting up apache2 (2.4.41-4ubuntu3) ...
info: Executing deferred 'a2enconf phppgadmin' for package phppgadmin
ERROR: Conf phppgadmin does not exist!
dpkg: error processing package apache2 (--configure):
 installed apache2 package post-installation script subprocess returned error exit status 1

[Miriam España Acebal (mirespace)]

Hi,

doing some clearance I found this bug.

Groovy reached EOSS (End of Standard Support) so I'm afraid it can't be fixed. It is unfortunate that we were unable to resolve this defect, however, there appears to be no further action possible at this time because it's not a security bug.

Also, I checked that the configuration question that Bryce commented on #3 still arises when doing releases upgrades (from Focal to Hirsute and from Hirsute to Impish), so I'm targeting this series as well.