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Use Absinthe 2.0.4 to Jailbreak iOS 5.1.1 on Ubuntu full details here

JailBreak iOS on Linux with Absinthe

    Absinthe is multiplatform iOS5 JailBreak tool which can easily be used on iPhone 4S and iPad2. Absinthe have a linux version too. Jailbreaking is the process of modifying the iOS Kernel which enables you to install apps from sources other than Apple AppStore. You will need libimobildevice from its PPA or through following commands

    sudo add-apt-repository ppa:pmcenery/ppa
    sudo apt-get update
    sudo apt-get install libimobiledevice-utils

    If you have trouble installing through above instructions than you can always look libimobiledevice.org

    Now download Asinthe 0.3 from following link
    Download Absinthe

    After download look for absinthe.x86 if you are on x86 Linux distribution and look for absinthe.x86_64 if you are on 64bit operating system.

    After opening your required file a window of Absinthe will pop up, than just follow on screen instructions to jailbreak your device.