Is it possible to have iOS simulator in my Linux Mint?
Two solutions:
OSX Virtual Machine: Run a VMWare OSX image inside Linux and install XCode. You will have the most accurate iOS emulator where you can choose iPad2, iPad. iPhone5, iPhone6, 6+, rotation of screen, etc.
Google Chrome: Load your webpage, right click and click on Inspect Element. On the new window called Developer Tools click on the mobile phone icon and now you get a very good emulator of iOS / Android and Windows Phone devices (Mobile and tablet).
The quickest way to test it would be through a browser extension that automatically resizes the browser to resolutions specific to mobile devices. There's even extensions that will request mobile sites.
The not so quick way, is to use an online simulator like http://transmog.net/ or https://www.browserstack.com/list-of-browsers-and-platforms?product=live#ios