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

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.

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

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.

Status changed to 'Confirmed' because the bug affects multiple users.

Groovy and Hirsute reached the end of regular support, so I am marking those tasks as Won't Fix.

Ubuntu 21.10 (Impish Indri) has reached end of life, so this bug will not be fixed for that specific release.