Ubuntu – Can’t start apache2.4 after upgrading subversion to 1.8.5

System: Ubuntu 13.10

I can't start Apache2 after I upgraded svn to 1.8.5 [wandisco] yesterday. The error I get

$sudo service apache2 start
 * Starting web server apache2                                                                                                                                                * 
 * The apache2 configtest failed.
Output of config test was:
apache2: Syntax error on line 142 of /etc/apache2/apache2.conf: Syntax error on line 2 of /etc/apache2/mods-enabled/authz_svn.load: Cannot load /usr/lib/apache2/modules/mod_authz_svn.so into server: libsvn_repos-1.so.1: cannot open shared object file: No such file or directory
Action 'configtest' failed.
The Apache error log may have more information.

[There is no additional info in apache log]

I tried this: http://ubuntuforums.org/archive/index.php/t-1777292.html

$locate mod_dav_svn.so
/usr/lib/apache2/modules/mod_dav_svn.so

So I changed my /etc/apache2/mods-enabled/authz_svn.load to:

# Depends: dav_svn
# LoadModule authz_svn_module /usr/lib/apache2/modules/mod_authz_svn.so
LoadModule authz_svn_module /usr/lib/apache2/modules/mod_dav_svn.so

But I'm still getting the same error, just with path to the module changed.

$sudo service apache2 start
 * Starting web server apache2                                                                                                                                                * 
 * The apache2 configtest failed.
Output of config test was:
apache2: Syntax error on line 142 of /etc/apache2/apache2.conf: Syntax error on line 3 of /etc/apache2/mods-enabled/authz_svn.load: Cannot load /usr/lib/apache2/modules/mod_dav_svn.so into server: libsvn_repos-1.so.1: cannot open shared object file: No such file or directory
Action 'configtest' failed.
The Apache error log may have more information.

The strangest thing is that both files exist and are readable

$ls -la /usr/lib/apache2/modules/mod_authz_svn.so
-rw-r--r-- 1 root root 18872 paź 15 16:03 /usr/lib/apache2/modules/mod_authz_svn.so
$ls -la /usr/lib/apache2/modules/mod_dav_svn.so
-rw-r--r-- 1 root root 173224 paź 15 16:03 /usr/lib/apache2/modules/mod_dav_svn.so

Info about my svn:

$svn --version
svn, version 1.8.5 (r1542147)
   compiled Nov 19 2013, 15:29:58 on x86_64-unknown-linux-gnu

Copyright (C) 2013 The Apache Software Foundation.
This software consists of contributions made by many people;
see the NOTICE file for more information.
Subversion is open source software, see http://subversion.apache.org/

Są dostępne następujące moduły dostępu do repozytorium (RA):

* ra_svn : Moduł umożliwiający dostęp do repozytorium przy pomocy protokołu svn.
  - z uwierzytelnianiem Cyrus SASL
  - obsługuje protokół 'svn'
* ra_local : Moduł umożliwiający dostęp do repozytorium na lokalnym dysku.
  - obsługuje protokół 'file'
* ra_serf : Module for accessing a repository via WebDAV protocol using serf.
  - using serf 1.3.2
  - obsługuje protokół 'http'
  - obsługuje protokół 'https'

I'm out of ideas. I will be grateful for your help.

UPDATE

I downgradeg svn to 1.7.9 – now it works.