Bug#996549: upgrade-reports: Upgrade from buster to bullseye disables php module while apache2 running

[Philipp <eingemaischt@gmail.com>]

Package: upgrade-reports
Severity: important

(Please provide enough information to help the Debian
maintainers evaluate the report efficiently - e.g., by filling
in the sections below.)

My previous release is: Debian Buster
I am upgrading to: Debian Bullseye
Archive date: recent version
Upgrade date: 10/15/2021
Method: I replaced buster with bullseye in /etc/apt/sources.list, then apt {update|upgrade|dist-upgrade}

Contents of /etc/apt/sources.list:
deb http://ftp.de.debian.org/debian/ bullseye main
deb http://security.debian.org/debian-security bullseye-security main
deb http://ftp.de.debian.org/debian/ bullseye-updates main


- Were there any non-Debian packages installed before the upgrade?  If
  so, what were they?
No.

- Was the system pre-update a pure sarge system? If not, which packages
  were not from sarge?
Yes.

- Did any packages fail to upgrade?
No.

- Were there any problems with the system after upgrading?
php7.4 was installed over php7.3. Therefore, php7.3 has been deactivated as apache2 module. But the installer did not enable php7.4. So, after a reboot, apache2 started to deliver php files as text files. This is a _serious_ issue if you don't realize it fast enough because the php files may contain config or other sensible information.

Further Comments/Problems:

The upgrade-process or the libapache2-mod-php7.4 package should auto-enable php7.4 with a2enmod - especially during an upgrade from another php version...