Error with installing ROS indigo on ubuntu 14.04

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It gibes me the error

N: Ignoring file 'ros' in directory '/etc/apt/sources.list.d/' as it has no filename extension

which I feel in this case is pretty clear: you have a file which has just a name - ros - but without any file extension. apt doesn't know what sort of file that is, so it decides to ignore it.

From the wiki page you linked:

Did you perhaps not copy the entire line? That would result in a file named ros to be created, instead of ros-latest.list.

Try adding the extension .list to the file and see whether that improves things. I suspect it will (provided that the file contains what it is supposed to).