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I am using indigo on Ubuntu 14.04.

You appear to be using an End Of Life version of ROS on an End Of Life version of Ubuntu.

Support for Ubuntu Trusty has been disabled in rosdep, which is a likely cause of the problem you are running into.

rosdep downloads files from a central repository, but does not download them for EOL distributions of ROS.

Notice how rosdep prints this for Indigo:

Skip end-of-life distro "indigo"

If you want to continue using these EOL versions (and you could, but just realise that no development targets these versions of the software any more, and Canonical does not release any updates for Trusty either), you'd have to explicitly ask rosdep to --include-eol-distros when running rosdep update.