Comment 6 for bug 598418

@Omer Akram:
If you are facing problems with users commenting on dups , it is due to the comment does not have complete response.
It would be better to use the proper *complete* reply informing them not to comment on the dup.

Which is why we already have the reply template for that , https://wiki.ubuntu.com/Bugs/Responses#A%20duplicate :

"Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug NUMBER, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find."

It informs user to comment on main bug.