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				@@ -90,6 +90,16 @@ sudo apt-get install -y libgflags-dev libgtest-dev libc++-dev clang 
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				 # Python dependencies 
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				 sudo pip install tabulate 
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				 sudo pip install google-api-python-client 
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				+sudo pip install virtualenv 
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				+ 
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				+# TODO(jtattermusch): For some reason, building gRPC Python depends on python3.4 
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				+# being installed, but python3.4 is not available on Ubuntu 16.04. 
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				+# Temporarily fixing this by adding a PPA with python3.4, but we should 
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				+# really remove this hack once possible. 
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				+sudo add-apt-repository -y ppa:fkrull/deadsnakes 
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				+sudo apt-get update 
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				+sudo apt-get install -y python3.4 python3.4-dev 
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				+python3.4 -m pip install virtualenv 
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				 curl -O https://bootstrap.pypa.io/get-pip.py 
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				 sudo pypy get-pip.py 
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				@@ -105,17 +115,17 @@ nvm install 4 && npm config set cache /tmp/npm-cache 
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				 nvm install 5 && npm config set cache /tmp/npm-cache 
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				 nvm alias default 4 
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				-# C# dependencies (http://www.mono-project.com/docs/getting-started/install/linux/#debian-ubuntu-and-derivatives) 
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				- 
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				+# C# mono dependencies (http://www.mono-project.com/docs/getting-started/install/linux/#debian-ubuntu-and-derivatives) 
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				 sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF 
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				 echo "deb http://download.mono-project.com/repo/debian wheezy main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list 
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				 sudo apt-get update 
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				 sudo apt-get install -y mono-devel nuget 
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				-# The version of nuget that is installed using apt-get is too old to download 
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				-# the System.Interactive.Async.3.0.0 C# dependency. Update to the latest version 
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				-# in order to be able download it. 
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				-sudo nuget update -self 
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				+# C# .NET Core dependencies (https://www.microsoft.com/net/core#ubuntu) 
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				+sudo sh -c 'echo "deb [arch=amd64] https://apt-mo.trafficmanager.net/repos/dotnet-release/ xenial main" > /etc/apt/sources.list.d/dotnetdev.list' 
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				+sudo apt-key adv --keyserver apt-mo.trafficmanager.net --recv-keys 417A0893 
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				+sudo apt-get update 
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				+sudo apt-get install -y dotnet-dev-1.0.0-preview2-003131 
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				 # Ruby dependencies 
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				 gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 
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