Update from Kolab 3.4 to 16, problems with roundcube

[Jonas Meier]

Hi,

today I finally tried to update from Kolab 3.4 to the current Kolab 16.
I am on Debian Jessie and got a package conflict for roundcubemail and 
roundcubemail-core.

This is the error message I get (in German):
dpkg: Fehler beim Bearbeiten des Archivs 
/var/cache/apt/archives/roundcubemail_1%3a1.2.4-0~kolab2.3_all.deb 
(--unpack):
  Versuch, »/usr/share/roundcubemail/index.php« zu überschreiben, 
welches auch in Paket roundcubemail-core 1:1.2.4-0

Basically it says that /usr/share/roundcubemail/index.php is provided by 
both packages.
Anybody else stumbled upon this and knows how to resolve it?

Thanks in advance,
Jonas

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