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[thermoman <1899611@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

I just upgraded apache2:amd64 2.4.18-2ubuntu3.15 --> 2.4.18-2ubuntu3.17
and now there is a file

  /etc/apache2/apache2.conf.in

with the following difference to apache2.conf:

% diff -u /etc/apache2/apache2.conf /etc/apache2/apache2.conf.in
--- /etc/apache2/apache2.conf     2020-08-13 03:35:57.000000000 +0200
+++ /etc/apache2/apache2.conf.in  2020-07-21 05:13:31.000000000 +0200
@@ -71,7 +71,7 @@
 #
 # The accept serialization lock file MUST BE STORED ON A LOCAL DISK.
 #
-#Mutex file:${APACHE_LOCK_DIR} default
+___MUTEX___Mutex file:${APACHE_LOCK_DIR} default
 
 #
 # PidFile: The file in which the server should record its process

apache2.conf.in is part of the .deb file, see

  https://packages.ubuntu.com/xenial-updates/amd64/apache2/filelist

apache2.conf.in is not mentioned in any config file in /etc/apache2,
not in the init.d script or systemd service file nor in the changelog.

What's the purpose of that file?

>From the diff above it doesn't even look like a valid apache2 config file
because of the "___MUTEX___" prefix.

Is this some kind of leftover from a search/replace operation?

** Affects: apache2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1899611

Title:
  Purpose unclear of unknown file /etc/apache2/apache2.conf.in

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