CentOS 7 - Kolab install fails with brocken packages

[Dr. Hirn]

Hi Andrea,

> it is only shoot in the cloud but perhaps it helps! if you use at the
> Moment yum priorities deactivate the priorities setting in the
> yum.repos.d Directory including in case of for epel repo. I had such
> issues with activated yum priorities.

it looks like priorities is not installed.
I could try to install it and set the priorities. But which repo should 
have the highest?

Thx,
Stefan