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Hallo I have the same problem. Unfortunately, none of your solutions work for me.

Here the snippet from the terminal

Gazebo multi-robot simulator, version 2.2.5
Copyright (C) 2012-2014 Open Source Robotics Foundation.
Released under the Apache 2 License.
http://gazebosim.org

azebo multi-robot simulator, version 2.2.5
Copyright (C) 2012-2014 Open Source Robotics Foundation.
Released under the Apache 2 License.
http://gazebosim.org

32mMsg Waiting for master
Msg Connected to gazebo master @ http://127.0.0.1:11345
Msg Publicized address: 10.0.2.15
Msg Waiting for master
Msg Connected to gazebo master @ http://127.0.0.1:11345
Msg Publicized address: 10.0.2.15
Warning [ModelDatabase.cc:334] Getting models from[http://gazebosim.org/models/]. This may take a few seconds.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Error [gazebo.cc:220] Waited 11 seconds for namespaces. Giving up.
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Node.cc:90] No namespace found
Error [Param.cc:181] Unable to set value [1,0471975511965976] for key[horizontal_fov]
Error [Param.cc:181] Unable to set value [0,100000001] for key[near]

And the content of the setup.sh

export GAZEBO_MASTER_URI=http://localhost:11345
export GAZEBO_MODEL_DATABASE_URI=http://gazebosim.org/models
export GAZEBO_RESOURCE_PATH=/usr/share/gazebo-2.2:/usr/share/gazebo_models
export GAZEBO_PLUGIN_PATH=/usr/lib/i386-linux-gnu/gazebo-2.2/plugins
export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/usr/lib/i386-linux-gnu/gazebo-2.2/plugins
export OGRE_RESOURCE_PATH=/usr/lib/i386-linux-gnu/OGRE-1.8.0

Then for me everything looks fine, but it does't work.

Perhaps any of you has a idea to solve my problem.

Is it a problem with ubuntu 14.04.2 or with virtual box?

I am surprised that this problem has not occurred more often.