title: Debian apt-get failing with up-to-date dependencies
body: <p>I'm having difficulty updating <code>owncloud</code> from 9.0.1 to 9.0.4. I've set an apt exemption for owncloud because previous system-wide <code>apt-get upgrade</code> calls were <a href="https://forum.owncloud.org/viewtopic.php?t=30324" rel="nofollow noreferrer">'upgrading' owncloud from 8.x to 4.x</a>.  But so far upgraded with <code>apt-get upgrade owncloud</code> has worked ok.  Now I'm hitting:</p>
  
  <pre><code>root@raspi:/home/pi# apt-get install owncloud
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:
  
  The following packages have unmet dependencies:
   owncloud : Depends: php-doctrine-dbal (&lt; 2.5) but 2.5.4-2 is to be installed
              Depends: php-pimple (&lt; 2) but 3.0.2-2 is to be installed
              Recommends: exim4 but it is not going to be installed or
                          mail-transport-agent
              Recommends: php-aws-sdk (&lt; 3) but it is not going to be installed
              Recommends: php-crypt-blowfish (&gt;= 1.1.0~RC2-2~) but it is not going to be installed
              Recommends: php-dropbox but it is not going to be installed
              Recommends: php-google-api-php-client (&lt; 1) but it is not going to be installed
              Recommends: php5-imap but it is not going to be installed
              Recommends: php5-ldap but it is not going to be installed
              Recommends: smbclient but it is not going to be installed
  E: Unable to correct problems, you have held broken packages.
  </code></pre>
  
  <p>However:</p>
  
  <pre><code>root@raspi:/home/pi# apt-get install php-doctrine-dbal php-pimple
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  php-doctrine-dbal is already the newest version (2.5.4-2).
  php-pimple is already the newest version (3.0.2-2).
  0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
  </code></pre>
  
  <p>The <code>php-doctrine-dbal</code> and <code>php-pimple</code> are latest version, so why does apt-get think not?  I've tried running <code>apt-get install -f</code>, which reports <code>0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded</code>.  Does not fix the problem however. Assistance much appreciated.</p>