No definition of [sensor_msgs] for OS version []

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Hello, I am new to ROS. Just installed Indigo on linux Mint 17 (ubuntu 14.04 based).

When going through a tutorial I run:

$ rosdep install joint_state_publisher

And get the next message:

ERROR: the following packages/stacks could not have their rosdep keys resolved
to system dependencies:
joint_state_publisher: Unsupported OS [mint]

After a little research, I tried

$ export ROS_OS_OVERRIDE=ubuntu:14.04

But now, after the same rosdep install call I get:

ERROR: the following packages/stacks could not have their rosdep keys resolved
to system dependencies:
joint_state_publisher: No definition of [sensor_msgs] for OS version []

I am not very sure of what I should try now. I thought Ubuntu 14.04 was supported and in most similar issues people get some key inside the last brackets of the message.

I read about declaring a new OS, but Mint is already in the list of rosdep and that's getting me even more confused. I also got to this issue on github, which is still open and seems related.

I am lost but willing to work a lot on it, so any advice is appreciated. Thanks a lot.