Arduino Serial Port Greyed

Hi all,
I am new to Arduino . I am working on a project to record temperature from the sensor using arduino. The problem which i am facing is :
After installing the ide to my laptop, the serial port option is greyed.

I looked up to some resources which are available on internet, but of no use.

I have arduino pro-mini the simple, with AtMega(5V-328), and the OS ubuntu-16.04

Please help me out to solve this.

Thanks in advance

Do you have the Arduino
Plugged in , are you using a data type USB lead ( and not a charger lead )?

For a pro mini, you will need a so-called ftdi cable that allows you to communicate with the pro mini.