Comment 1 for bug 1243006

It would appear that this function has been re-implemented in PCManFM with the Copy Path(s) option, available under the Edit > dropdown menu. If you have not already upgraded to a 1.2.0 or higher (available in repos for trusty and utopic), I would encourage you to do so to take advantage of this feature. Here is a link to the update announcement: http://blog.lxde.org/?p=1082

Because it seems this is resolved, I will be marking this as "Fix Released" - thank you for taking the time to help improve Ubuntu!