Till now I was using "Rabbit VCS", but after changing my laptop somehow unable to install it properly. So, I have become a new user to "bazaar" which can be installed directly from "Ubuntu Software Center".
Checked out the code from Unfuddle.com which worked perfectly fine.
Getting below error while performing my first commit using bazaar's GUI tool.
python: /build/buildd/subversion-1.7.5/subversion/libsvn_subr/dirent_uri.c:1253: svn_relpath_basename: Assertion `relpath_is_canonical(relpath)' failed.
There is a bug raised on this at Ubuntu launchpad. However couldn't find any fix for that.