Comment 1 for bug 1467180

Root cause lays in packages dependency for ceilometer:

debug: Executing '/usr/bin/apt-get -q -y -o DPkg::Options::=--force-confold install ceilometer-alarm-evaluator'
2015-06-20T21:27:19.367251+00:00 err: Execution of '/usr/bin/apt-get -q -y -o DPkg::Options::=--force-confold install ceilometer-alarm-evaluator' returned 100: Reading package lists...
2015-06-20T21:27:19.367642+00:00 err: Building dependency tree...
2015-06-20T21:27:19.367642+00:00 err: Reading state information...
2015-06-20T21:27:19.367642+00:00 err: Some packages could not be installed. This may mean that you have
2015-06-20T21:27:19.367642+00:00 err: requested an impossible situation or if you are using the unstable
2015-06-20T21:27:19.367642+00:00 err: distribution that some required packages have not yet been created
2015-06-20T21:27:19.367642+00:00 err: or been moved out of Incoming.
2015-06-20T21:27:19.367642+00:00 err: The following information may help to resolve the situation:
2015-06-20T21:27:19.367642+00:00 err:
2015-06-20T21:27:19.367642+00:00 err: The following packages have unmet dependencies:
2015-06-20T21:27:19.367642+00:00 err: ceilometer-alarm-evaluator : Depends: ceilometer-common (= 2014.2.2-1~u14.04+mos9) but it is not going to be installed
2015-06-20T21:27:19.367642+00:00 err: E: Unable to correct problems, you have held broken packages.