I have install latest version of ant from https://launchpad.net/ubuntu/xenial/+source/ant and also i have done with setup as well. but i don't get any package.xml file, so how can i do deployment in salesforce.
The metadata toolkit comes with a sample package.xml file. Copying the jar file doesn't automatically give you a package.xml file, nor is there a way to automatically generate one.
It's been a while since I've used Ubuntu, but it should go something like this:
sudo apt-get install ant cd mkdir -p .ant/lib cd Downloads unzip salesforce.zip cp lib/ant-salesforce.jar ~/.ant/lib/
At that point, create a new place for you to start working:
cd mkdir workspace cd workspace
There, create your build.xml, build.properties, and package.xml files (or copy them from ~/Downloads/samples, if you followed my code), and then start from there.
You'll really want to look at the sample files to see how to get started. They include information on how to do retrieves, listMetadata, deletes, and so on. Also, the Migration Tool home page has a link to the documentation that explains every available "task" (as Ant calls them), the parameters you can use, and so on.