Rollback not work cause apache2 cannot start

{

    "build_id": "2014-09-05_00-01-17",
    "ostf_sha": "f7b5d9d0d1cfaba5f1fe1e2c634493e92bce11db",
    "build_number": "499",
    "auth_required": true,
    "api": "1.0",
    "nailgun_sha": "b36dccbc28584532ca1bdb679b096cc3f5f6f80a",
    "production": "docker",
    "fuelmain_sha": "b3afef75675ae3ab251a4f990f3432968eb746eb",
    "astute_sha": "b622d9b36dbdd1e03b282b9ee5b7435ba649e711",
    "feature_groups": [
        "mirantis"
    ],
    "release": "5.1",
    "fuellib_sha": "6ebadd157c5153e9bb3ed53fa73507a5c73572c3"

}

Ubuntu, HA, NeutronVLAN

Steps to reproduce:
1. Install 5.0 node (26 build).
2. Deploy env: ubuntu, HA, NeutronVLAN, 3 controllers, compute, storage.
3. Upgrade Fuel to 5.1
4. Patch env to 5.0.2
5. Try to rollback env.

Expect: all is ok

Result:
Rollback failed due to errors:

Mon Sep 08 07:56:19 +0000 2014 Puppet (err): Could not update: Execution of '/usr/bin/apt-get -q -y -o DPkg::Options::=--force-confold --force-yes install openstack-dashboard=1:2014.1.fuel5.0~mira4' returned 100: Reading package lists...
Building dependency tree...
Reading state information...
The following extra packages will be installed:
  libapache2-mod-wsgi openstack-dashboard-ubuntu-theme python-appconf
  python-ceilometerclient python-cloudfiles python-compressor python-django
  python-django-horizon python-openstack-auth python-troveclient
Suggested packages:
  python-psycopg2 python-psycopg python-flup python-sqlite
  geoip-database-contrib gettext python-lesscpy
The following NEW packages will be installed:
  libapache2-mod-wsgi openstack-dashboard openstack-dashboard-ubuntu-theme
  python-appconf python-ceilometerclient python-cloudfiles python-compressor
  python-django python-django-horizon python-openstack-auth python-troveclient
0 upgraded, 11 newly installed, 0 to remove and 0 not upgraded.
Need to get 9274 kB of archives.
After this operation, 42.1 MB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  python-django python-appconf python-compressor libapache2-mod-wsgi
  python-ceilometerclient python-cloudfiles python-openstack-auth
  python-troveclient python-django-horizon openstack-dashboard
  openstack-dashboard-ubuntu-theme
Authentication warning overridden.
Get:1 http://10.108.0.2/ubuntu/fuelweb/x86_64/ precise/main python-django all 1.5.4-ubuntu0 [5463 kB]
Get:2 http://10.108.0.2/ubuntu/fuelweb/x86_64/ precise/main python-appconf all 0.5-2~cloud0 [8070 B]
Get:3 http://10.108.0.2/ubuntu/fuelweb/x86_64/ precise/main python-compressor all 1.3-0ubuntu1~cloud0 [60.5 kB]
Get:4 http://10.108.0.2/ubuntu/fuelweb/x86_64/ precise/main libapache2-mod-wsgi amd64 3.3-4build1 [72.7 kB]
Get:5 http://10.108.0.2/ubuntu/fuelweb/x86_64/ precise/main python-ceilometerclient all 1.0.9.fuel5.0~mira0 [63.0 kB]
Get:6 http://10.108.0.2/ubuntu/fuelweb/x86_64/ precise/main python-cloudfiles all 1.7.9.2-1 [20.6 kB]
Get:7 http://10.108.0.2/ubuntu/fuelweb/x86_64/ precise/main python-openstack-auth all 1.1.1-0ubuntu1~cloud0 [23.0 kB]
Get:8 http://10.108.0.2/ubuntu/fuelweb/x86_64/ precise/main python-troveclient all 1:1.0.3.fuel5.0~mira0 [96.6 kB]
Get:9 http://10.108.0.2/ubuntu/fuelweb/x86_64/ precise/main python-django-horizon all 1:2014.1.fuel5.0~mira4 [725 kB]
Get:10 http://10.108.0.2/ubuntu/fuelweb/x86_64/ precise/main openstack-dashboard all 1:2014.1.fuel5.0~mira4 [2697 kB]
Get:11 http://10.108.0.2/ubuntu/fuelweb/x86_64/ precise/main openstack-dashboard-ubuntu-theme all 1:2014.1.fuel5.0~mira4 [44.8 kB]
Fetched 9274 kB in 1s (5931 kB/s)
Selecting previously unselected package python-django.
(Reading database ... 108899 files and directories currently installed.)
Unpacking python-django (from .../python-django_1.5.4-ubuntu0_all.deb) ...
Selecting previously unselected package python-appconf.
Unpacking python-appconf (from .../python-appconf_0.5-2~cloud0_all.deb) ...
Selecting previously unselected package python-compressor.
Unpacking python-compressor (from .../python-compressor_1.3-0ubuntu1~cloud0_all.deb) ...
Selecting previously unselected package libapache2-mod-wsgi.
Unpacking libapache2-mod-wsgi (from .../libapache2-mod-wsgi_3.3-4build1_amd64.deb) ...
Selecting previously unselected package python-ceilometerclient.
Unpacking python-ceilometerclient (from .../python-ceilometerclient_1.0.9.fuel5.0~mira0_all.deb) ...
Selecting previously unselected package python-cloudfiles.
Unpacking python-cloudfiles (from .../python-cloudfiles_1.7.9.2-1_all.deb) ...
Selecting previously unselected package python-openstack-auth.
Unpacking python-openstack-auth (from .../python-openstack-auth_1.1.1-0ubuntu1~cloud0_all.deb) ...
Selecting previously unselected package python-troveclient.
Unpacking python-troveclient (from .../python-troveclient_1%3a1.0.3.fuel5.0~mira0_all.deb) ...
Selecting previously unselected package python-django-horizon.
Unpacking python-django-horizon (from .../python-django-horizon_1%3a2014.1.fuel5.0~mira4_all.deb) ...
Selecting previously unselected package openstack-dashboard.
Unpacking openstack-dashboard (from .../openstack-dashboard_1%3a2014.1.fuel5.0~mira4_all.deb) ...
Selecting previously unselected package openstack-dashboard-ubuntu-theme.
Unpacking openstack-dashboard-ubuntu-theme (from .../openstack-dashboard-ubuntu-theme_1%3a2014.1.fuel5.0~mira4_all.deb) ...
Processing triggers for man-db ...
Setting up python-django (1.5.4-ubuntu0) ...
Setting up python-appconf (0.5-2~cloud0) ...
Setting up python-compressor (1.3-0ubuntu1~cloud0) ...
Setting up libapache2-mod-wsgi (3.3-4build1) ...
Setting up python-ceilometerclient (1.0.9.fuel5.0~mira0) ...
Setting up python-cloudfiles (1.7.9.2-1) ...
Setting up python-openstack-auth (1.1.1-0ubuntu1~cloud0) ...
Setting up python-troveclient (1:1.0.3.fuel5.0~mira0) ...
Setting up python-django-horizon (1:2014.1.fuel5.0~mira4) ...
Setting up openstack-dashboard (1:2014.1.fuel5.0~mira4) ...

Configuration file `/etc/openstack-dashboard/local_settings.py'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
 ==> Using current old file as you requested.
Syntax error on line 6 of /etc/apache2/conf.d/openstack-dashboard.conf:
Invalid command 'WSGIScriptAlias', perhaps misspelled or defined by a module not included in the server configuration
Action 'configtest' failed.
The Apache error log may have more information.
   ...fail!
dpkg: error processing openstack-dashboard (--configure):
 subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of openstack-dashboard-ubuntu-theme:
 openstack-dashboard-ubuntu-theme depends on openstack-dashboard (= 1:2014.1.fuel5.0~mira4); however:
  Package openstack-dashboard is not configured yet.
dpkg: error processing openstack-dashboard-ubuntu-theme (--configure):
 dependency problems - leaving unconfigured
No apport report written because MaxReports is reached already
No apport report written because MaxReports is reached already
Errors were encountered while processing:
 openstack-dashboard
 openstack-dashboard-ubuntu-theme
E: Sub-process /usr/bin/dpkg returned an error code (1)
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/etc/puppet/modules/package/lib/puppet/type/package.rb:108
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/usr/lib/ruby/vendor_ruby/puppet/application/apply.rb:268:in `apply_catalog'
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/usr/lib/ruby/vendor_ruby/puppet/application/apply.rb:146:in `run_command'
/usr/lib/ruby/vendor_ruby/puppet/application.rb:364:in `run'
/usr/lib/ruby/vendor_ruby/puppet/application.rb:470:in `plugin_hook'
/usr/lib/ruby/vendor_ruby/puppet/application.rb:364:in `run'
/usr/lib/ruby/vendor_ruby/puppet/util.rb:478:in `exit_on_fail'
/usr/lib/ruby/vendor_ruby/puppet/application.rb:364:in `run'
/usr/lib/ruby/vendor_ruby/puppet/util/command_line.rb:137:in `run'
/usr/lib/ruby/vendor_ruby/puppet/util/command_line.rb:91:in `execute'
/usr/bin/puppet:4