Transform an Android device into a Linux machine
The apps I've described are not your only options for running Linux on an Android device. The Complete Linux Installer  and Linux Installer  apps, for example, let you install a Linux distribution on a rooted Android device. If you own a Google Nexus 7 device, you can replace Android with Ubuntu by following the instructions on the Ubuntu wiki . The described solutions have their advantages and drawbacks, but because they are all available free of charge, you can try them all and pick the one that best fits your needs.
- KBOX: http://kevinboone.net/kbox.html
- Using standard Linux utilities in a stock, non-rooted Android device: http://kevinboone.net/android_nonroot.html
- Linux Deploy: http://play.google.com/store/apps/details?id=ru.meefik.linuxdeploy
- VX ConnectBot: http://play.google.com/store/apps/details?id=sk.vx.connectbot
- MultiVNC: http://play.google.com/store/apps/details?id=com.coboltforge.dontmind.multivnc
- Debian Mirrors: http://www.debian.org/mirror/list
- Limbo PC Emulator: http://play.google.com/store/apps/details?id=com.max2idea.android.limbo.main
- Limbo at Google Code: http://code.google.com/p/limbo-android/wiki/LimboAndroid
- Complete Linux Installer: http://play.google.com/store/apps/details?id=com.zpwebsites.linuxonandroid
- Linux Installer STANDARD: http://play.google.com/store/apps/details?id=com.galoula.LinuxInstall
- Ubuntu on Nexus 7 installation instructions: http://wiki.ubuntu.com/Nexus7/Installation
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