This app will install Debian Wheezy.
You do not need to root your device, it will work fine with any stock ROM.
You will need 600 Mb free on internal storage. This app cannot be installed to SD card.
A mouse or stylus is highly recommended.
This app is NOT full Debian OS - it is a compatibility layer, which allows you to run Debian applications.
Your phone is NOT rooted during installation.
This is NOT official Debian.org release.
Please use apt-get in root terminal to install packages, because Synaptic sometimes crashes.
If you have Error -24 when installing this app - install this version (it's the same app with different name):
Do not uninstall this app - you will not be able to install it again, because of a bug in Android: https://code.google.com/p/android/issues/detail?id=68310
Clear app data instead to save space - long-press app icon in drawer, drag it to App Info icon, and select Clear data.
If you want to use web browser, open Root terminal and run command apt-get update ; apt-get install iceweasel
If you want to use Eclipse or other Java applications, install package openjdk-7-jdk and restart Debian app, because default JDK does not work on Samsung devices.
To disable gyroscope, tap Change device config during app start, select Mouse emulation → Advanced → Gyroscope.
To enable audio - run the script Enable audio from the desktop, it will download additional 100Mb, then reboot your device. Some audio players work, like Exaile or Clementine, some do not, like Audacity. Audio is very laggy, and this cannot be fixed.
To set 24bpp color depth or portrait screen orientation, go to Change device config → Video.
Sources are here:
This app uses PRoot for running Debian. All hail PRoot and it's most gracious developer, Cédric VINCENT!
This app will download 220 Mb data, and will use 600 Mb of internal storage.
Fixed another bug, which happens on Android 4.0 and 4.1