Ubuntu Slave Agent
Enable Launch Slave Agents via Java Web Start
Add New Ubuntu Slave Agent
From jenkins home page, click to Manage Jenkins, then click to Manage Nodes
From Nodes screen, click to New Node
Put the name “Ubuntu_Agent”, click to Save button
Specify Remote root directory, then click Save button
Launch Slave Agent
Go to Ubuntu machine which you want it become a jenkins agent and click to Ubuntu_Agent
Click to Launch button
Click to OK button
One dialog will show up that agent and master already connect
Now you will see Ubuntu_Agent up and running from Jenkins home page. And you could create job which need to running on Ubuntu machine.