its working now and this fixed my problem incase some one else have saming problem
) use this method
Often, problems with USB to Serial are associated with a package that is loaded by default called Brltty.
Brltty is a package for the blind and is used with Braille readers.
If you remove this package, hopefully, things should work.
sudo apt-get remove brltty
sudo apt-get remove brltty-x11