Comment 1 for bug 1476726

mysql-wsrep package is a custom build of MySQL-server, with patches for Galera (which are not in upstream):
https://review.fuel-infra.org/gitweb?p=packages/trusty/mysql-wsrep-5.6.git;a=blob;f=debian/control;h=ad3d7b68cb8015f62fecf2cbb8bec03859ce25c2;hb=bf5a03beff445b88d3ec6f9c1c1d16741ae60036

It is not correct to mix them on the same machine.

Build team, please recheck (taken from LP #1475288):
http://osci-jenkins.srt.mirantis.net:8080/job/7.0.mos-new.install-deb/893/consoleFull