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A. Install Ubuntu Touch:

1. Fisrt you need to root your GT-I9300. Download and do it with Samsung Galaxy S3 ToolKit. Choose appropriate model and reset the ROM.
2. Download ubuntu-for-i9300 & quantal-preinstalled-phablet-armhf.
3. Copy these file to SD Card.
4. Shutdown Galaxy S III and hold Volume Up + Home + Power simultaneously.
5. Wipe data.
6. First install ubuntu-for-i9300 & then quantal-preinstalled-phablet-armhf.
7. Reboot. Your GT-I9300 will boot into ubuntu touch.

But noting will work. In my case no GSM network, no Wi-Fi. All buttons are not working properly. Even can’t lock the phone.

B. Android Jelly Bean:
1. Download latest cyanogenmod from following link:
http://download.cyanogenmod.org/?type=nightly&device=i9300
2. Search for GApps for CM10.1 in search engine. I have download GApps from following link:
http://goo.im/gapps/gapps-jb-20130301-signed.zip
3. Copy these files to SD Card.
4. Shutdown Galaxy S III and hold Volume Up + Home + Power simultaneously.
5. Chose install from sdcard option. First install CM 10.1 and then GApps.
6. Reboot the phone, you are done.