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Download the latest version of Heimball: http://www.glassechidna.com.au/products/heimdall/
Install the the .deb package

Just double click on it :)

Download your favorite version of the Stock ROM: [ROM+Guide]Official i9100 Firmwares KG, KH, KI1/2/3/4/8, KJ1/2/3, KK1/2/5 Download - xda-developers

Unpack the file “I9100********.tar.md5”

tar xvf I9100*****.tar.md5

Boot your phone to download mode

- Switch it off

- - Press and hold Home+Volume Down+Power until you see the “Warning” message

- - Connect via USB to PC

- Confirm it with Volume Up

Check if the phone is detected

heimdall detect

Flash it with heimdall (do it with as root to avoid access problems to usb devices)

heimdall flash --primary-boot boot.bin --cache cache.img --factoryfs factoryfs.img --hidden hidden.img --modem modem.bin --param param.lfs --secondary-boot Sbl.bin --kernel zImage