Can anybody tell me the best perl editor that can be used on Ubuntu/Linux ?

I prefer emacs myself, but I've used vi, vim, Eclipse and a few others.

I hate the term "best" in the context you've used it. "Best" for me is likely to be uncomfortable at the least for at least one other person. It all boils down to personal preference and how much hand holding you want when you are coding.

If by some bizarre quirk of fate my wife was to write a program in Perl she'd probably try to write it using OpenOffice writer. :-)